https://www.w3.org/TR/geometry-1/#dom-dompointreadonly
https://www.w3.org/TR/web-animations-1/#keyframeeffectreadonly
https://www.w3.org/TR/web-animations-1/#dom-keyframeeffectreadonly-target
https://www.w3.org/TR/css-text-3/#hyphens-property
https://w3c.github.io/svg-aam/#details-id-69
https://www.w3.org/TR/css3-mediaqueries/#syntax
https://www.w3.org/TR/css-position-3/#vp
https://www.w3.org/TR/css-shapes/#basic-shape-interpolation
https://www.w3.org/TR/css-color-3/#colorunits
https://www.w3.org/TR/css-color-3/#svg-color
https://www.w3.org/TR/css-selectors-3/#the-user-action-pseudo-classes-hover-act

Links to definitions that are not exported:

https://html.spec.whatwg.org/#reflect
https://html.spec.whatwg.org/#set-of-comma-separated-tokens
https://html.spec.whatwg.org/#valid-integer
https://html.spec.whatwg.org/#boolean-attribute
https://html.spec.whatwg.org/#global-attributes
https://html.spec.whatwg.org/#cors-settings-attribute
https://html.spec.whatwg.org/#focused
https://html.spec.whatwg.org/#focusable
https://html.spec.whatwg.org/#create-a-potential-cors-request
https://html.spec.whatwg.org/#valid-browsing-context-name
https://html.spec.whatwg.org/#ping
https://html.spec.whatwg.org/#mime-type
https://html.spec.whatwg.org/#limited-to-only-known-values
https://w3c.github.io/selection-api/#dfn-direction
https://w3c.github.io/selection-api/#dfn-selection
https://fetch.spec.whatwg.org/#concept-cors-check

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-SVG11-20110816/
https://www.w3.org/TR/2008/REC-xml-20081126/
https://www.w3.org/TR/2006/REC-xml-names-20060816/
https://www.w3.org/TR/2008/REC-SMIL3-20081201/
https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2012/CR-WebIDL-20120419/
https://www.w3.org/TR/2015/CR-compositing-1-20150113/
https://www.w3.org/TR/2015/CR-compositing-1-20150113
https://www.w3.org/TR/2014/CR-geometry-1-20141125/
https://www.w3.org/TR/2014/WD-geometry-1-20140522/
https://www.w3.org/TR/2014/CR-html5-20140204/
https://www.w3.org/TR/2014/WD-dom-20140204/
https://www.w3.org/TR/2013/REC-css-style-attr-20131107/
https://www.w3.org/TR/2011/WD-css3-fonts-20111004/
https://www.w3.org/TR/2003/REC-MathML2-20031021/
https://www.w3.org/TR/2001/REC-smil-animation-20010904/
https://www.w3.org/TR/2001/REC-xlink-20010627/
https://www.w3.org/TR/2015/NOTE-UAAG20-20151215/
https://www.w3.org/TR/2008/REC-CSS2-20080411/
https://www.w3.org/TR/2015/WD-svg-markers-20150407/
https://www.w3.org/TR/2015/WD-svg-strokes-20150407/

Timing Entry Names Registry
Links to definitions that are not exported:

https://www.w3.org/TR/performance-timeline-2/#dfn-registered-performance-observer
https://www.w3.org/TR/performance-timeline-2/#dfn-options-list
https://www.w3.org/TR/performance-timeline-2/#dfn-observer
https://www.w3.org/TR/performance-timeline-2/#dfn-observer-buffer

Touch Events - Level 2
Links to anchors that are not definitions or headings:

https://dom.spec.whatwg.org/#event-retargeting-steps

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

UI Events KeyboardEvent code Values
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/uievents-key/#key-value-tables
https://www.w3.org/TR/uievents-key/#key-ArrowDown
https://www.w3.org/TR/uievents-key/#key-Alphanumeric
https://www.w3.org/TR/uievents-key/#key-CapsLock
https://www.w3.org/TR/uievents-key/#key-NumLock
https://www.w3.org/TR/uievents-key/#key-SymbolLock
https://www.w3.org/TR/uievents-key/#key-Alt
https://www.w3.org/TR/uievents-key/#key-AltGraph

UI Events KeyboardEvent key Values
Links to definitions that are not exported:

https://www.w3.org/TR/uievents/#dead-key
https://www.w3.org/TR/uievents/#compositionupdate

UI Events
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/uievents-key/#key-ArrowDown
https://www.w3.org/TR/uievents-key/#key-Enter
https://www.w3.org/TR/uievents-key/#key-Shift
https://www.w3.org/TR/uievents-key/#key-Control
https://www.w3.org/TR/uievents-key/#key-Alt
https://www.w3.org/TR/uievents-key/#key-Meta
https://www.w3.org/TR/uievents-key/#key-ArrowLeft
https://www.w3.org/TR/uievents-key/#key-ArrowRight
https://www.w3.org/TR/uievents-key/#key-ArrowUp
https://www.w3.org/TR/uievents-key/#key-End
https://www.w3.org/TR/uievents-key/#key-Home
https://www.w3.org/TR/uievents-key/#key-PageDown
https://www.w3.org/TR/uievents-key/#key-PageUp
https://www.w3.org/TR/uievents-key/#key-AltGr
https://www.w3.org/TR/uievents-key/#key-Dead
https://www.w3.org/TR/uievents-key/#key-Convert
https://www.w3.org/TR/uievents-key/#key-Accept
https://www.w3.org/TR/uievents-key/#key-Cancel
https://www.w3.org/TR/uievents-key/#key-Alphanumeric
https://www.w3.org/TR/uievents-key/#key-CodeInput
https://www.w3.org/TR/uievents-key/#key-FinalMode
https://www.w3.org/TR/uievents-key/#key-HangulMode
https://www.w3.org/TR/uievents-key/#key-HanjaMode
https://www.w3.org/TR/uievents-key/#key-Hiragana
https://www.w3.org/TR/uievents-key/#key-JunjaMode
https://www.w3.org/TR/uievents-key/#key-KanaMode
https://www.w3.org/TR/uievents-key/#key-KanjiMode
https://www.w3.org/TR/uievents-key/#key-Katakana
https://www.w3.org/TR/uievents-key/#key-RomanCharacters
https://www.w3.org/TR/uievents-key/#key-AllCandidates
https://www.w3.org/TR/uievents-key/#key-Compose
https://www.w3.org/TR/uievents-key/#key-FullWidth
https://www.w3.org/TR/uievents-key/#key-HalfWidth
https://www.w3.org/TR/uievents-key/#key-NextCandidate
https://www.w3.org/TR/uievents-key/#key-Nonconvert
https://www.w3.org/TR/uievents-key/#key-PreviousCandidate
https://www.w3.org/TR/uievents-key/#key-Tab
https://www.w3.org/TR/uievents-key/#key-MediaTrackNext
https://www.w3.org/TR/uievents-code/#code-ArrowDown
https://www.w3.org/TR/uievents-code/#code-Equal
https://www.w3.org/TR/uievents-code/#code-KeyQ
https://www.w3.org/TR/uievents-code/#code-ControlLeft
https://www.w3.org/TR/uievents-code/#code-AltLeft
https://www.w3.org/TR/uievents-code/#code-AltRight
https://www.w3.org/TR/uievents-code/#code-Quote
https://www.w3.org/TR/uievents-code/#code-Digit2
https://www.w3.org/TR/uievents-code/#code-ShiftLeft
https://www.w3.org/TR/uievents-code/#code-
https://html.spec.whatwg.org/#context-menus

Links to definitions that are not exported:

https://www.w3.org/TR/uievents-key/#key-attribute-value

Links to dated TR URLs:

https://www.w3.org/TR/2004/REC-xml-20040204/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Upgrade Insecure Requests
Links to anchors that are not definitions or headings:

https://fetch.spec.whatwg.org/#concept-request-target-browsing-context

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/
https://www.w3.org/TR/workers/

User Timing Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/hr-time-2/#dfn-performance
https://www.w3.org/TR/hr-time-2/#idl-def-domhighrestimestamp
https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/navigation-timing/#performancetiming

Links to definitions that are not exported:

https://www.w3.org/TR/performance-timeline-2/#dfn-queue-a-performanceentry
https://www.w3.org/TR/performance-timeline-2/#dfn-performance-entry-buffer
https://www.w3.org/TR/performance-timeline-2/#dfn-performance-timeline
https://html.spec.whatwg.org/#concept-current-everything

User Timing Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/hr-time-2/#dfn-performance
https://www.w3.org/TR/hr-time-2/#idl-def-domhighrestimestamp
https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/navigation-timing/#performancetiming

Links to definitions that are not exported:

https://www.w3.org/TR/performance-timeline-2/#dfn-queue-a-performanceentry
https://www.w3.org/TR/performance-timeline-2/#dfn-performance-entry-buffer
https://www.w3.org/TR/performance-timeline-2/#dfn-performance-timeline
https://html.spec.whatwg.org/#concept-current-everything

Vibration API (Second Edition)
Links to anchors that are not definitions or headings:

https://w3c.github.io/page-visibility/#dfn-steps-to-determine-the-visibility-state

Links to definitions that are not exported:

https://html.spec.whatwg.org/#spin-the-event-loop

Links to dated TR URLs:

https://www.w3.org/TR/2016/REC-WebIDL-1-20161215/

Accessible Rich Internet Applications (WAI-ARIA) 1.2
Links to definitions that are not exported:

https://html.spec.whatwg.org/#enumerated-attribute
https://html.spec.whatwg.org/#missing-value-default
https://html.spec.whatwg.org/#invalid-value-default
https://html.spec.whatwg.org/#translatable-attributes
https://html.spec.whatwg.org/#reflect

Links to dated TR URLs:

https://www.w3.org/TR/2007/REC-xforms-20071029/
https://www.w3.org/TR/2006/REC-xml-names-20060816/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

WebAssembly JavaScript Interface
Links to definitions that are not exported:

https://heycam.github.io/webidl/#create-a-namespace-object

WebAssembly Web API
Links to definitions that are not exported:

https://webassembly.github.io/spec/js-api/#instantiate-a-promise-of-a-module
https://webassembly.github.io/spec/js-api/#asynchronously-compile-a-webassembly-module
https://webassembly.github.io/spec/js-api/#compile-a-webassembly-module
https://webassembly.github.io/spec/js-api/#exported-function
https://fetch.spec.whatwg.org/#concept-body-consume-body

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262

Web Animations
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#document
https://html.spec.whatwg.org/#an-entry-with-persisted-user-state
https://w3c.github.io/hr-time/#time-origin
https://w3c.github.io/hr-time/#domhighrestimestamp
https://heycam.github.io/webidl/#dfn-present
https://heycam.github.io/webidl/#DOMString-to-es
https://heycam.github.io/webidl/#es-to-dictionary
https://heycam.github.io/webidl/#es-to-DOMString

Links to definitions that are not exported:

https://html.spec.whatwg.org/#media-element
https://html.spec.whatwg.org/#being-rendered
https://html.spec.whatwg.org/#event-loop-processing-model
https://html.spec.whatwg.org/#run-the-animation-frame-callbacks
https://html.spec.whatwg.org/#session-history-entry

Web Audio API
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#the-errorevent-interface
https://heycam.github.io/webidl/#dfn-present
https://heycam.github.io/webidl/#es-to-sequence
https://heycam.github.io/webidl/#dictionary-to-es
https://w3c.github.io/mediacapture-fromelement/#dom-htmlmediaelement-capturestream()

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-current-everything
https://html.spec.whatwg.org/#event
https://html.spec.whatwg.org/#cors-cross-origin

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html50/
https://www.w3.org/TR/2dcontext/

Web Authentication: An API for accessing Public Key Credentials - Level 2
Links to anchors that are not definitions or headings:

https://w3c.github.io/webappsec-credential-management/#collectfromcredentialstore-origin-options-sameoriginwithancestors
https://w3c.github.io/webappsec-credential-management/#store-credential-sameoriginwithancestors
https://w3c.github.io/webappsec-credential-management/#create-origin-options-sameoriginwithancestors
https://url.spec.whatwg.org/#host-same-site
https://infra.spec.whatwg.org/#serialize-json-to-bytes
https://w3c.github.io/webdriver/#dfn-error

Links to definitions that are not exported:

https://w3c.github.io/webappsec-credential-management/#same-origin-with-its-ancestors
https://url.spec.whatwg.org/#valid-domain
https://w3c.github.io/webdriver/#dfn-extension-command
https://w3c.github.io/webdriver/#dfn-extension-capability
https://w3c.github.io/webdriver/#dfn-endpoint-node
https://w3c.github.io/webdriver/#dfn-validate-capabilities
https://w3c.github.io/webdriver/#dfn-error-code
https://w3c.github.io/webdriver/#dfn-invalid-argument
https://w3c.github.io/webdriver/#dfn-matching-capabilities
https://w3c.github.io/webdriver/#dfn-remote-end-steps
https://w3c.github.io/webdriver/#dfn-getting-properties
https://w3c.github.io/webdriver/#dfn-set-a-property
https://w3c.github.io/webdriver/#dfn-unsupported-operation
https://w3c.github.io/webdriver/#dfn-success

WebDriver
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#dom-document-activeelement
https://html.spec.whatwg.org/#document
https://html.spec.whatwg.org/#button-state-(type=button)
https://html.spec.whatwg.org/#checkbox-state-(type=checkbox)
https://html.spec.whatwg.org/#code-entry-point
https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#hidden-state-(type=hidden)
https://html.spec.whatwg.org/#image-button-state-(type=image)
https://html.spec.whatwg.org/#an-overridden-reload
https://html.spec.whatwg.org/#radio-button-state-(type=radio)
https://html.spec.whatwg.org/#submit-button-state-(type=submit)
https://html.spec.whatwg.org/#concept-output-mode
https://html.spec.whatwg.org/#e-mail-state-(type=email)
https://www.w3.org/TR/page-visibility/#visibility-states-and-the-visibilitystate-enum
https://www.w3.org/TR/geometry-1/#dom-domrect
https://url.spec.whatwg.org/#syntax-url-absolute
https://url.spec.whatwg.org/#syntax-url-absolute-with-fragment
https://url.spec.whatwg.org/#syntax-url-path-absolute
https://heycam.github.io/webidl/#dfn-DOMException

Links to definitions that are not exported:

https://html.spec.whatwg.org/#2d-context-creation-algorithm
https://html.spec.whatwg.org/#a-serialisation-of-the-bitmap-as-a-file
https://html.spec.whatwg.org/#concept-fe-api-value
https://html.spec.whatwg.org/#boolean-attribute
https://html.spec.whatwg.org/#concept-button
https://html.spec.whatwg.org/#candidate-for-constraint-validation
https://html.spec.whatwg.org/#concept-canvas-context-mode
https://html.spec.whatwg.org/#concept-fe-checked
https://html.spec.whatwg.org/#close-a-browsing-context
https://html.spec.whatwg.org/#cookie-averse-document-object
https://html.spec.whatwg.org/#current-entry
https://html.spec.whatwg.org/#concept-input-checked-dirty-flag
https://html.spec.whatwg.org/#concept-fe-dirty
https://html.spec.whatwg.org/#concept-fe-disabled
https://html.spec.whatwg.org/#current-document-readiness
https://html.spec.whatwg.org/#concept-element-contexts
https://html.spec.whatwg.org/#enumerated-attribute
https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#focusable-area
https://html.spec.whatwg.org/#concept-input-apply
https://html.spec.whatwg.org/#concept-input-type-file-selected
https://html.spec.whatwg.org/#joint-session-history
https://html.spec.whatwg.org/#concept-navigate-mature
https://html.spec.whatwg.org/#missing-value-default
https://html.spec.whatwg.org/#concept-fe-mutable
https://html.spec.whatwg.org/#concept-canvas-origin-clean
https://html.spec.whatwg.org/#pause
https://html.spec.whatwg.org/#prompt-to-unload-a-document
https://html.spec.whatwg.org/#concept-textarea-raw-value
https://html.spec.whatwg.org/#attr-meta-http-equiv-refresh
https://html.spec.whatwg.org/#concept-form-reset-control
https://html.spec.whatwg.org/#category-reset
https://html.spec.whatwg.org/#run-the-animation-frame-callbacks
https://html.spec.whatwg.org/#concept-fv-valid
https://html.spec.whatwg.org/#concept-option-selectedness
https://html.spec.whatwg.org/#session-history
https://html.spec.whatwg.org/#category-submit
https://html.spec.whatwg.org/#suffering-from-bad-input
https://html.spec.whatwg.org/#traverse-the-history
https://html.spec.whatwg.org/#traverse-the-history-by-a-delta
https://html.spec.whatwg.org/#tree-order
https://html.spec.whatwg.org/#unfocusing-steps
https://html.spec.whatwg.org/#concept-fe-value
https://html.spec.whatwg.org/#value-sanitization-algorithm
https://html.spec.whatwg.org/#window-open-steps
https://html.spec.whatwg.org/#color-state-(type=color)
https://html.spec.whatwg.org/#date-state-(type=date)
https://html.spec.whatwg.org/#local-date-and-time-state-(type=datetime-local)
https://html.spec.whatwg.org/#month-state-(type=month)
https://html.spec.whatwg.org/#password-state-(type=password)
https://html.spec.whatwg.org/#range-state-(type=range)
https://html.spec.whatwg.org/#telephone-state-(type=tel)
https://html.spec.whatwg.org/#text-(type=text)-state-and-search-state-(type=search)
https://html.spec.whatwg.org/#time-state-(type=time)
https://html.spec.whatwg.org/#url-state-(type=url)
https://html.spec.whatwg.org/#week-state-(type=week)
https://w3c.github.io/uievents/#keydown
https://w3c.github.io/uievents/#keypress
https://w3c.github.io/uievents/#keyup
https://w3c.github.io/uievents/#activation-trigger
https://www.w3.org/TR/accname-1.1/#dfn-accessible-name
https://w3c.github.io/DOM-Parsing/#dfn-fragment-serializing-algorithm
https://fullscreen.spec.whatwg.org/#fullscreen-an-element
https://fullscreen.spec.whatwg.org/#fullscreen-is-supported
https://fullscreen.spec.whatwg.org/#fully-exit-fullscreen
https://fullscreen.spec.whatwg.org/#unfullscreen-a-document
https://url.spec.whatwg.org/#default-port

Web IDL
Links to definitions that are not exported:

https://html.spec.whatwg.org/#serializable-objects

Identity for WebRTC 1.0
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/webrtc/#dom-rtcconfiguration-peeridentity
https://www.w3.org/TR/webrtc/#sec.stats-model
https://w3c.github.io/webrtc-pc/#dfn-create-an-offer
https://w3c.github.io/webrtc-pc/#dfn-create-an-answer

Links to definitions that are not exported:

https://www.w3.org/TR/webrtc/#set-pc-configuration
https://w3c.github.io/webrtc-pc/#dfn-offerer-s-system-state
https://w3c.github.io/webrtc-pc/#dfn-signaling-state
https://w3c.github.io/webrtc-pc/#dfn-in-parallel-steps-to-create-an-offer
https://w3c.github.io/webrtc-pc/#dfn-final-steps-to-create-an-offer
https://w3c.github.io/webrtc-pc/#dfn-answerer-s-system-state
https://w3c.github.io/webrtc-pc/#dfn-in-parallel-steps-to-create-an-answer
https://w3c.github.io/webrtc-pc/#dfn-final-steps-to-create-an-answer
https://fetch.spec.whatwg.org/#concept-cors-check

Links to dated TR URLs:

https://www.w3.org/TR/2016/REC-WebIDL-1-20161215/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html51/
https://www.w3.org/TR/webmessaging/
https://www.w3.org/TR/workers/

WebRTC 1.0: Real-Time Communication Between Browsers
Links to definitions that are not exported:

https://html.spec.whatwg.org/#serializable-objects
https://html.spec.whatwg.org/#network
https://www.w3.org/TR/mediacapture-streams/#track-ended
https://fetch.spec.whatwg.org/#concept-cors-check

WebVTT: The Web Video Text Tracks Format
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#case-sensitive
https://html.spec.whatwg.org/#skip-whitespace
https://html.spec.whatwg.org/#rules-for-extracting-the-chapter-title
https://dom.spec.whatwg.org/#dom-node-namespaceuri

Links to definitions that are not exported:

https://html.spec.whatwg.org/#text-track-kind
https://html.spec.whatwg.org/#text-track
https://html.spec.whatwg.org/#text-track-cue
https://html.spec.whatwg.org/#text-track-list-of-cues
https://html.spec.whatwg.org/#list-of-text-tracks
https://html.spec.whatwg.org/#media-element
https://html.spec.whatwg.org/#text-track-mode
https://html.spec.whatwg.org/#text-track-showing
https://html.spec.whatwg.org/#rules-for-updating-the-text-track-rendering
https://html.spec.whatwg.org/#text-track-cue-active-flag
https://html.spec.whatwg.org/#text-track-cue-display-state
https://html.spec.whatwg.org/#ascii-digits
https://html.spec.whatwg.org/#current-playback-position
https://html.spec.whatwg.org/#syntax-charref
https://html.spec.whatwg.org/#presentational-hints
https://html.spec.whatwg.org/#text-track-cue-identifier
https://html.spec.whatwg.org/#text-track-cue-pause-on-exit-flag
https://html.spec.whatwg.org/#split-a-string-on-spaces
https://html.spec.whatwg.org/#text-track-cue-start-time
https://html.spec.whatwg.org/#text-track-cue-end-time
https://html.spec.whatwg.org/#expose-a-user-interface-to-the-user
https://html.spec.whatwg.org/#text-track-cue-order
https://html.spec.whatwg.org/#entry-settings-object
https://html.spec.whatwg.org/#honor-user-preferences-for-automatic-text-track-selection

WebXR Augmented Reality Module - Level 1
Links to definitions that are not exported:

https://immersive-web.github.io/webxr/#exclusive-access
https://immersive-web.github.io/webxr/#immersive-session
https://immersive-web.github.io/webxr/#xr-compositor
https://immersive-web.github.io/webxr/#xr-device
https://immersive-web.github.io/webxr/#xrsession-mode
https://immersive-web.github.io/webxr/#xrspace-native-origin
https://immersive-web.github.io/webxr/#xrsession-viewer-reference-space
https://immersive-web.github.io/webxr/#secondary-view
https://immersive-web.github.io/webxr/#view-eye
https://immersive-web.github.io/webxr/#secondary-view-secondary-views
https://immersive-web.github.io/webxr/#feature-descriptor

WebXR Gamepads Module - Level 1
Links to definitions that are not exported:

https://www.w3.org/TR/webxr/#xrsession-list-of-frame-updates
https://www.w3.org/TR/webxr/#xrframe-time
https://immersive-web.github.io/webxr/#viewer
https://immersive-web.github.io/webxr/#xrsession-xr-device
https://immersive-web.github.io/webxr/#list-of-active-xr-input-sources
https://immersive-web.github.io/webxr/#primary-action
https://immersive-web.github.io/webxr/#primary-squeeze-action
https://immersive-web.github.io/webxr/#sensitive-information

WebXR Hand Input Module - Level 1
Links to definitions that are not exported:

https://immersive-web.github.io/webxr/#xr-device
https://immersive-web.github.io/webxr/#feature-descriptor
https://immersive-web.github.io/webxr/#xrsession-xr-device
https://immersive-web.github.io/webxr/#xrinputsource-input-profile-name
https://immersive-web.github.io/webxr/#xrspace-native-origin
https://immersive-web.github.io/webxr/#xrframe-time
https://immersive-web.github.io/webxr/#xrspace-session
https://immersive-web.github.io/webxr/#populate-the-pose
https://immersive-web.github.io/webxr/#xrsession-animation-frame
https://immersive-web.github.io/webxr/#explicit-consent

WebXR Device API
Links to definitions that are not exported:

https://html.spec.whatwg.org/#rendering-opportunity
https://html.spec.whatwg.org/#currently-focused-area-of-a-top-level-browsing-context
https://immersive-web.github.io/webxr-ar-module/#first-person-observer-view
https://www.w3.org/TR/pointerevents/#dfn-primary-pointer

WOFF File Format 2.0
Links to dated TR URLs:

https://www.w3.org/TR/2012/REC-WOFF-20121213/

XMLHttpRequest Standard
Links to anchors that are not definitions or headings:

https://infra.spec.whatwg.org/#parse-json-from-bytes

Links to definitions that are not exported:

https://w3c.github.io/DOM-Parsing/#dfn-fragment-serializing-algorithm

Links to dated TR URLs:

https://www.w3.org/TR/2008/REC-SVGTiny12-20081222/

Unknown specs:
[
"I-D",
"aria",
"av1-isobmff",
"av1-rtp-spec",
"av1-spec",
"charmod",
"charmod-norm",
"contentEditable",
"css-text-decoration",
"dpub-aria-1.0",
"ecma262",
"editing",
"html401",
"its20",
"ltli",
"mathml",
"media-frags",
"pronunciation-lexicon",
"role-attribute",
"ruby",
"smil",
"smil-animation",
"spec",
"specs",
"speech-synthesis11",
"trace-context-protocols-registry",
"wasm-core",
"wcag",
"webappsec",
"webcomponents",
"wsc-ui",
"xforms11",
"xhtml1",
"xlink",
"xlink11",
"xml",
"xml-id",
"xml-names",
"xml-names11",
"xml-stylesheet",
"xml11",
"xmlbase",
"xmlschema-2",
"xmlschema11-2",
"xpath-10",
"xslt"
]

The study now has broken link detection; the report below focuses on that only - quite a few. It's starting to feel like something that spec editing tools themselves could catch early via our collected data (but probably not trivially given the need to map urls to specs)
DOM Standard
Links to anchors that don't exist:

https://w3c.github.io/DOM-Parsing/#dfn-createcontextualfragment-fragment

CSS Backgrounds and Borders Module Level 4
Links to anchors that don't exist:

https://www.w3.org/TR/css3-transitions/#animtype-color

CSS Shapes Module Level 2
Links to anchors that don't exist:

https://www.w3.org/TR/css-shapes-1/#typedef-fill-rule

Scroll-linked Animations
Links to anchors that don't exist:

https://w3c.github.io/web-animations/#duration
https://w3c.github.io/web-animations/#target-effect-end

Compositing and Blending Level 2
Links to anchors that don't exist:

https://www.w3.org/TR/css3-background/#placement

HTML Standard
Links to anchors that don't exist:

https://dom.spec.whatwg.org/#dom-element-setAttribute
https://url.spec.whatwg.org/#concept-url-object
https://w3c.github.io/FileAPI/#DefinitionOfScheme
https://heycam.github.io/webidl/#dfn-obtain-unicode
https://heycam.github.io/webidl/#idl-Error
https://w3c.github.io/DOM-Parsing/#dom-element-innerhtml
https://w3c.github.io/webvtt/#webvtt-file-using-cue-text
https://w3c.github.io/manifest/#dfn-manifest
https://www.w3.org/TR/css3-color/#css2-system

WebXR DOM Overlays Module
Links to anchors that don't exist:

https://www.w3.org/TR/webxr/#dom-xr-requestsession

WebXR Hit Test Module
Links to anchors that don't exist:

https://www.w3.org/TR/webxr/#feature-policy
https://www.w3.org/TR/webxr/#xrsession-list-of-enabled-features

WebXR Layers API Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/webxr/#animationframe

MathML Core
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#colorunits
https://www.w3.org/TR/css-color-3/#foreground
https://html.spec.whatwg.org/#event-handler-contentattributes
https://www.w3.org/TR/css-backgrounds-3/#padding-physical
https://heycam.github.io/webidl/#DOMException
https://www.w3.org/TR/css-position-3/#pos-sch
https://www.w3.org/TR/css-box-3/#the-border-width

The Storage Access API
Links to anchors that don't exist:

https://w3c.github.io/webdriver/webdriver-spec.html#dfn-extension-commands
https://w3c.github.io/webdriver/webdriver-spec.html#dfn-error

Quirks Mode Standard
Links to anchors that don't exist:

https://www.w3.org/TR/cssom-1/#css

Badging API
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#dfn-within-scope-manifest

Media Capture Automation
Links to anchors that don't exist:

https://www.w3.org/TR/mediacapture-streams/#request-permission-to-use
https://www.w3.org/TR/screen-capture/#dfn-getdisplaymedia
https://www.w3.org/TR/screen-capture/#prompt-the-user-to-choose

Web Share Target API
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#dfn-install

WebDriver BiDi
Links to anchors that don't exist:

https://w3c.github.io/webdriver/#dfn-intermediary-node
https://w3c.github.io/webdriver/#dfn-get-a-property
https://w3c.github.io/webdriver/#dfn-window-handle

Background Fetch
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-cancel-readablestream
https://fetch.spec.whatwg.org/#concept-readablestream-errored
https://fetch.spec.whatwg.org/#concept-construct-readablestream
https://fetch.spec.whatwg.org/#concept-enqueue-readablestream
https://fetch.spec.whatwg.org/#concept-readablestream-closed
https://fetch.spec.whatwg.org/#concept-readablestream-readable

Web Background Synchronization
Links to anchors that don't exist:

https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-registration-interface
https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-global-scope-interface
https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#extendable-event-interface
https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#dfn-extend-lifetime-promises

Client Hints Infrastructure
Links to anchors that don't exist:

https://wicg.github.io/ua-client-hints/#sec-ch-ua-mobile
https://wicg.github.io/ua-client-hints/#sec-ch-ua-arch
https://wicg.github.io/ua-client-hints/#sec-ch-ua-model
https://wicg.github.io/ua-client-hints/#sec-ch-ua-platform

Contact Picker API
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context
https://html.spec.whatwg.org/#triggered-by-user-activation

Content Index
Links to anchors that don't exist:

https://html.spec.whatwg.org/#replacement-enabled

Event Timing API
Links to anchors that don't exist:

https://w3c.github.io/hr-time/#dfn-performance
https://html.spec.whatwg.org/#event-dnd-dragexit

Get Installed Related Apps API
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#obtaining
https://html.spec.whatwg.org/#responsible-browsing-context

Early detection of input events
Links to anchors that don't exist:

https://heycam.github.io/webidl/#idl-Exposed

JS Self-Profiling API
Links to anchors that don't exist:

https://www.w3.org/TR/hr-time-2/#dfn-performance
https://www.w3.org/TR/permissions-policy-1/#feature-policy

Keyboard Lock
Links to anchors that don't exist:

https://www.w3.org/TR/uievents-code/#code-keyw
https://www.w3.org/TR/uievents-code/#code-keya
https://www.w3.org/TR/uievents-code/#code-keys
https://www.w3.org/TR/uievents-code/#code-keyd
https://www.w3.org/TR/uievents-code/#code-delete

Keyboard Map
Links to anchors that don't exist:

https://www.w3.org/TR/uievents-code/#code-quote

Layout Instability API
Links to anchors that don't exist:

https://www.w3.org/TR/css-values-4/#pixel-unit

Media Feeds
Links to anchors that don't exist:

https://html.spec.whatwg.org/#link
https://www.w3.org/TR/secure-contexts/#secure-context

Origin Policy
Links to anchors that don't exist:

https://wicg.github.io/feature-policy/#serialized-feature-policy
https://wicg.github.io/feature-policy/#feature-policy-header
https://infra.spec.whatwg.org/#parse-json-into-infra-values
https://w3c.github.io/webappsec-feature-policy/#merge-directive-with-declared-policy
https://w3c.github.io/webappsec-feature-policy/#parse-header-from-value-and-origin

Page Lifecycle
Links to anchors that don't exist:

https://www.w3.org/TR/page-visibility-2/#visibility-states-and-the-visibilitystate-enum

Save Data API
Links to anchors that don't exist:

https://wicg.github.io/netinfo/#network-information

Text Fragments
Links to anchors that don't exist:

https://w3c.github.io/webappsec-permissions-policy/document-policy.html#algo-get-policy-value
https://w3c.github.io/webappsec-permissions-policy/document-policy.html#configuration-point
https://w3c.github.io/webappsec-permissions-policy/document-policy.html#configuration-point-type
https://w3c.github.io/webappsec-permissions-policy/document-policy.html#configuration-point-default-value

Accelerated Shape Detection in Images
Links to anchors that don't exist:

https://w3c.github.io/mediacapture-image/#Point2D

Accelerated Text Detection in Images
Links to anchors that don't exist:

https://w3c.github.io/mediacapture-image/#Point2D

Web OTP API
Links to anchors that don't exist:

https://w3c.github.io/webappsec-credential-management/#collectfromcredentialstore-origin-options-sameoriginwithancestors

Accessible Name and Description Computation 1.2
Links to anchors that don't exist:

https://w3c.github.io/core-aam/#ariaLabel
https://w3c.github.io/core-aam/#ariaLabelledBy
https://w3c.github.io/core-aam/#ariaDescribedBy

Audio Output Devices API
Links to anchors that don't exist:

https://html.spec.whatwg.org/#triggered-by-user-activation

Battery Status API
Links to anchors that don't exist:

https://www.w3.org/TR/secure-contexts/#secure-context
https://wicg.github.io/feature-policy/#feature-name

Beacon
Links to anchors that don't exist:

https://www.w3.org/TR/page-visibility-2/#dfn-visibilitychange
https://www.w3.org/TR/page-visibility-2/#dfn-unload

Clipboard API and events
Links to anchors that don't exist:

https://html.spec.whatwg.org/#drag-data-item-kind
https://html.spec.whatwg.org/#drag-data-item-type-string
https://w3c.github.io/FileAPI/#dfn-blobparts

Compositing and Blending Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-background/#placement

Credential Management Level 1
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context

Content Security Policy: Embedded Enforcement
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context
https://w3c.github.io/webappsec-csp/#port-part-match

Content Security Policy Level 3
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-request-target-browsing-context
https://w3c.github.io/reporting/#group

CSS Box Alignment Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-grid-1/#grid-item-sizing
https://www.w3.org/TR/css-grid-1/#gutters
https://www.w3.org/TR/css-grid-1/#static-position
https://www.w3.org/TR/css3-grid-layout/#grid-baselines

CSS Animation Worklet API
Links to anchors that don't exist:

https://w3c.github.io/web-animations/level-2/#group-effect
https://w3c.github.io/web-animations/level-2/#child-effect

CSS Animations Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/cssom-1/#cssstyledeclaration-readonly-flag

CSS Backgrounds and Borders Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-box-3/#the-css-box-model
https://www.w3.org/TR/css3-transitions/#animatable-types
https://www.w3.org/TR/css3-color/#currentcolor

CSS Fragmentation Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css3-multicol/#column-box
https://www.w3.org/TR/css3-page/#left-right-first
https://www.w3.org/TR/css3-page/#facing-pages
https://www.w3.org/TR/css3-background/#background-positioning-area

CSS Color Module Level 4
Links to anchors that don't exist:

https://www.w3.org/TR/css-values-3/#typedef-number-percentage

CSS Device Adaptation Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-syntax/#property-defs
https://www.w3.org/TR/css3-conditional/#nested_statement
https://www.w3.org/TR/css3-conditional/#conditional-group-rules

CSS Generated Content for Paged Media Module
Links to anchors that don't exist:

https://www.w3.org/TR/css3-selectors/#first-letter

CSS Grid Layout Module Level 2
Links to anchors that don't exist:

https://www.w3.org/TR/css-writing-modes-3/#start
https://www.w3.org/TR/css-writing-modes-3/#end

CSS Images Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css3-background/#the-background-size
https://www.w3.org/TR/css3-background/#the-border-image-slice
https://www.w3.org/TR/css3-background/#border-image-area
https://www.w3.org/TR/css3-background/#border-image-process

CSS Masking Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-background/#layering
https://www.w3.org/TR/css3-background/#border-image-process
https://www.w3.org/TR/css-values-3/#typedef-number-percentage

CSS Overflow Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-backgrounds/#box-shadow

CSS Overflow Module Level 4
Links to anchors that don't exist:

https://www.w3.org/TR/css3-transitions/#animatable-types

CSS Positioned Layout Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-grid-1/#abspos-items
https://www.w3.org/TR/css-grid-1/#static-position

CSS Properties and Values API Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-syntax-3/#consume-a-name
https://www.w3.org/TR/cssom-1/#css

CSS Pseudo-Elements Module Level 4
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#currentcolor-def

CSS Shadow Parts
Links to anchors that don't exist:

https://www.w3.org/TR/selectors-4/#live-profile

CSS Shapes Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-transitions/#animatable-types
https://www.w3.org/TR/css3-transitions/#animtype-simple-list
https://www.w3.org/TR/css3-transitions/#animtype-lpcalc
https://www.w3.org/TR/css-box-3/#the-css-box-model

CSS Text Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-fonts-3/#feature-precedence

CSS Text Decoration Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#valuea-def-color
https://www.w3.org/TR/css-color-3/#color0

CSS Transitions
Links to anchors that don't exist:

https://www.w3.org/TR/css3-background/#shadow-inset

CSS Typed OM Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-values-3/#typedef-number-percentage

CSS Values and Units Module Level 4
Links to anchors that don't exist:

https://www.w3.org/TR/css-values-3/#acknowledgements

CSS Exclusions Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-shapes/#20120503

CSS Object Model (CSSOM)
Links to anchors that don't exist:

https://html.spec.whatwg.org/#style-sheet-ready

CSSOM View Module
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context

DOM Parsing and Serialization
Links to anchors that don't exist:

https://www.w3.org/TR/dom/#case-sensitive
https://www.w3.org/TR/dom/#ascii-case-insensitive
https://www.w3.org/TR/dom/#domexception
https://www.w3.org/TR/dom/#invalidstateerror
https://www.w3.org/TR/dom/#nomodificationallowederror
https://www.w3.org/TR/dom/#syntaxerror

Encrypted Media Extensions
Links to anchors that don't exist:

https://www.w3.org/TR/permissions-policy-1/#responsible-document
https://www.w3.org/TR/permissions-policy-1/#allowed-to-use
https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/secure-contexts/#secure-context

File API
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-construct-readablestream
https://fetch.spec.whatwg.org/#concept-error-readablestream
https://fetch.spec.whatwg.org/#concept-enqueue-readablestream
https://fetch.spec.whatwg.org/#concept-get-reader
https://fetch.spec.whatwg.org/#concept-read-all-bytes-from-readablestream
https://fetch.spec.whatwg.org/#concept-read-chunk-from-readablestream
https://mimesniff.spec.whatwg.org/#parsable-mime-type

CSS Fill and Stroke Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#valuea-def-color

Filter Effects Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-transitions-1/#animtype-length
https://www.w3.org/TR/css-transitions-1/#animtype-number
https://www.w3.org/TR/css-transitions-1/#animtype-shadow-list

Gamepad
Links to anchors that don't exist:

https://www.w3.org/TR/navigation-timing/#performancetiming

Generic Sensor API
Links to anchors that don't exist:

https://www.w3.org/TR/page-visibility-2/#dfn-steps-to-determine-the-visibility-state
https://w3c.github.io/webdriver/#dfn-session
https://w3c.github.io/webdriver/#dfn-local-end
https://w3c.github.io/webdriver/#handling-errors

Graphics Accessibility API Mappings
Links to anchors that don't exist:

https://w3c.github.io/graphics-aria/#graphics-document
https://w3c.github.io/graphics-aria/#graphics-object
https://w3c.github.io/graphics-aria/#graphics-symbol

HTML Accessibility API Mappings 1.0
Links to anchors that don't exist:

https://www.w3.org/TR/core-aam-1.1/#ariaRoleDescription
https://www.w3.org/TR/core-aam-1.1/#role-map-link
https://www.w3.org/TR/core-aam-1.1/#role-map-article
https://www.w3.org/TR/core-aam-1.1/#role-map-complementary
https://www.w3.org/TR/core-aam-1.1/#role-map-button
https://www.w3.org/TR/core-aam-1.1/#role-map-slider
https://www.w3.org/TR/core-aam-1.1/#role-map-toolbar
https://www.w3.org/TR/core-aam-1.1/#role-map-listbox
https://www.w3.org/TR/core-aam-1.1/#ariaMultiselectableFalse
https://www.w3.org/TR/core-aam-1.1/#role-map-definition
https://www.w3.org/TR/core-aam-1.1/#role-map-term
https://www.w3.org/TR/core-aam-1.1/#role-map-dialog
https://www.w3.org/TR/core-aam-1.1/#role-map-group
https://www.w3.org/TR/core-aam-1.1/#role-map-figure
https://www.w3.org/TR/core-aam-1.1/#role-map-contentinfo
https://www.w3.org/TR/core-aam-1.1/#role-map-form
https://www.w3.org/TR/core-aam-1.1/#role-map-heading
https://www.w3.org/TR/core-aam-1.1/#ariaLevel
https://www.w3.org/TR/core-aam-1.1/#role-map-banner
https://www.w3.org/TR/core-aam-1.1/#role-map-separator
https://www.w3.org/TR/core-aam-1.1/#role-map-img
https://www.w3.org/TR/core-aam-1.1/#role-map-presentation
https://www.w3.org/TR/core-aam-1.1/#role-map-checkbox
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedMixed
https://www.w3.org/TR/core-aam-1.1/#role-map-textbox
https://www.w3.org/TR/core-aam-1.1/#role-map-spinbutton
https://www.w3.org/TR/core-aam-1.1/#role-map-radio
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedTrue
https://www.w3.org/TR/core-aam-1.1/#ariaSetsize
https://www.w3.org/TR/core-aam-1.1/#ariaPosinset
https://www.w3.org/TR/core-aam-1.1/#role-map-searchbox
https://www.w3.org/TR/core-aam-1.1/#role-map-combobox
https://www.w3.org/TR/core-aam-1.1/#ariaOwns
https://www.w3.org/TR/core-aam-1.1/#role-map-listitem
https://www.w3.org/TR/core-aam-1.1/#role-map-main
https://www.w3.org/TR/core-aam-1.1/#role-map-math
https://www.w3.org/TR/core-aam-1.1/#role-map-list
https://www.w3.org/TR/core-aam-1.1/#role-map-menu
https://www.w3.org/TR/core-aam-1.1/#role-map-navigation
https://www.w3.org/TR/core-aam-1.1/#role-map-option
https://www.w3.org/TR/core-aam-1.1/#ariaSelectedTrue
https://www.w3.org/TR/core-aam-1.1/#role-map-status
https://www.w3.org/TR/core-aam-1.1/#role-map-progressbar
https://www.w3.org/TR/core-aam-1.1/#ariaValueMax
https://www.w3.org/TR/core-aam-1.1/#ariaValueMin
https://www.w3.org/TR/core-aam-1.1/#ariaValueNow
https://www.w3.org/TR/core-aam-1.1/#role-map-region
https://www.w3.org/TR/core-aam-1.1/#role-map-table
https://www.w3.org/TR/core-aam-1.1/#role-map-rowgroup
https://www.w3.org/TR/core-aam-1.1/#role-map-cell
https://www.w3.org/TR/core-aam-1.1/#role-map-grid
https://www.w3.org/TR/core-aam-1.1/#role-map-treegrid
https://www.w3.org/TR/core-aam-1.1/#role-map-gridcell
https://www.w3.org/TR/core-aam-1.1/#ariaMultilineTrue
https://www.w3.org/TR/core-aam-1.1/#role-map-columnheader
https://www.w3.org/TR/core-aam-1.1/#role-map-rowheader
https://www.w3.org/TR/core-aam-1.1/#role-map-row
https://www.w3.org/TR/core-aam-1.1/#ariaAutocompleteInlineListBoth
https://www.w3.org/TR/core-aam-1.1/#ariaFlowto
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedFalse
https://www.w3.org/TR/core-aam-1.1/#ariaColSpan
https://www.w3.org/TR/core-aam-1.1/#ariaDisabledTrue
https://www.w3.org/TR/core-aam-1.1/#ariaHiddenTrue
https://www.w3.org/TR/core-aam-1.1/#ariaControls
https://www.w3.org/TR/core-aam-1.1/#ariaExpandedTrue
https://www.w3.org/TR/core-aam-1.1/#ariaPlaceholder
https://www.w3.org/TR/core-aam-1.1/#ariaReadonlyTrue
https://www.w3.org/TR/core-aam-1.1/#ariaRequiredTrue
https://www.w3.org/TR/core-aam-1.1/#ariaRowSpan
https://www.w3.org/TR/core-aam-1.1/#ariaInvalidSpellingGrammar
https://html.spec.whatwg.org/#attr-iframe-allowpaymentrequest
https://html.spec.whatwg.org/#element-attrdef-track-kind
https://www.w3.org/TR/html/#element-attrdef-input-type
https://www.w3.org/TR/html/#button-state-typebutton
https://www.w3.org/TR/html/#checkbox-state-typecheckbox
https://www.w3.org/TR/html/#forms-checkedness
https://www.w3.org/TR/html/#color-state-typecolor
https://www.w3.org/TR/html/#date-state-typedate
https://www.w3.org/TR/html/#email-state-typeemail
https://www.w3.org/TR/html/#suggestions-source-element
https://www.w3.org/TR/html/#file-upload-state-typefile
https://www.w3.org/TR/html/#hidden-state-typehidden
https://www.w3.org/TR/html/#image-button-state-typeimage
https://www.w3.org/TR/html/#local-date-and-time-state-typedatetimelocal
https://www.w3.org/TR/html/#month-state-typemonth
https://www.w3.org/TR/html/#number-state-typenumber
https://www.w3.org/TR/html/#password-state-typepassword
https://www.w3.org/TR/html/#radio-button-state-typeradio
https://www.w3.org/TR/html/#range-state-typerange
https://www.w3.org/TR/html/#reset-button-state-typereset
https://www.w3.org/TR/html/#text-typetext-state-and-search-state-typesearch
https://www.w3.org/TR/html/#submit-button-state-typesubmit
https://www.w3.org/TR/html/#telephone-state-typetel
https://www.w3.org/TR/html/#url-state-typeurl
https://www.w3.org/TR/html/#element-attrdef-input-list
https://www.w3.org/TR/html/#time-state-typetime
https://www.w3.org/TR/html/#week-state-typeweek
https://www.w3.org/TR/html/#element-attrdef-select-multiple
https://www.w3.org/TR/html/#element-attrdef-select-size
https://www.w3.org/TR/html/#svg
https://www.w3.org/TR/html/#element-attrdef-label-for
https://www.w3.org/TR/html/#element-attrdef-output-for
https://www.w3.org/TR/html/#element-attrdef-formelements-form
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formaction
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formenctype
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formmethod
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formnovalidate
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formtarget
https://www.w3.org/TR/html/#element-attrdef-tablecells-headers
https://www.w3.org/TR/html/#element-attrdef-canvas-height
https://www.w3.org/TR/html/#element-attrdef-media-height
https://www.w3.org/TR/html/#element-attrdef-link-href
https://www.w3.org/TR/html/#element-attrdef-a-hreflang
https://www.w3.org/TR/html/#elementdef-area
https://www.w3.org/TR/html/#element-attrdef-link-hreflang
https://www.w3.org/TR/html/#element-attrdef-meta-http-equiv
https://www.w3.org/TR/html/#element-attrdef-global-id
https://www.w3.org/TR/html/#element-attrdef-input-checked
https://www.w3.org/TR/html/#element-attrdef-img-ismap
https://www.w3.org/TR/html/#element-attrdef-global-lang
https://www.w3.org/TR/html/#element-attrdef-media-loop
https://www.w3.org/TR/html/#element-attrdef-input-maxlength
https://www.w3.org/TR/html/#element-attrdef-textarea-maxlength
https://www.w3.org/TR/html/#element-attrdef-link-media
https://www.w3.org/TR/html/#element-attrdef-source-media
https://www.w3.org/TR/html/#element-attrdef-style-media
https://www.w3.org/TR/html/#element-attrdef-form-method
https://www.w3.org/TR/html/#element-attrdef-input-multiple
https://www.w3.org/TR/html/#element-attrdef-media-muted
https://www.w3.org/TR/html/#element-attrdef-formelements-name
https://www.w3.org/TR/html/#element-attrdef-form-name
https://www.w3.org/TR/html/#element-attrdef-iframe-name
https://www.w3.org/TR/html/#element-attrdef-object-name
https://www.w3.org/TR/html/#element-attrdef-map-name
https://www.w3.org/TR/html/#element-attrdef-meta-name
https://www.w3.org/TR/html/#element-attrdef-param-name
https://www.w3.org/TR/html/#element-attrdef-form-novalidate
https://www.w3.org/TR/html/#element-attrdef-details-open
https://www.w3.org/TR/html/#element-attrdef-input-placeholder
https://www.w3.org/TR/html/#element-attrdef-textarea-placeholder
https://www.w3.org/TR/html/#element-attrdef-input-readonly
https://www.w3.org/TR/html/#element-attrdef-textarea-readonly
https://www.w3.org/TR/html/#element-attrdef-a-rel
https://www.w3.org/TR/html/#element-attrdef-link-rel
https://www.w3.org/TR/html/#element-attrdef-input-required
https://www.w3.org/TR/html/#element-attrdef-select-required
https://www.w3.org/TR/html/#element-attrdef-textarea-required
https://www.w3.org/TR/html/#element-attrdef-tablecells-rowspan
https://www.w3.org/TR/html/#element-attrdef-iframe-sandbox
https://www.w3.org/TR/html/#element-attrdef-option-selected
https://www.w3.org/TR/html/#element-attrdef-area-shape
https://www.w3.org/TR/html/#element-attrdef-col-span
https://www.w3.org/TR/html/#element-attrdef-colgroup-span
https://www.w3.org/TR/html/#element-attrdef-a-target
https://www.w3.org/TR/html/#element-attrdef-base-target
https://www.w3.org/TR/html/#element-attrdef-form-target
https://www.w3.org/TR/html/#element-attrdef-global-title
https://www.w3.org/TR/html/#element-attrdef-abbr-title
https://www.w3.org/TR/html/#element-attrdef-dfn-title
https://www.w3.org/TR/html/#element-attrdef-link-title
https://www.w3.org/TR/html/#element-attrdef-style-title
https://www.w3.org/TR/html/#element-attrdef-global-translate
https://www.w3.org/TR/html/#element-attrdef-a-type
https://www.w3.org/TR/html/#element-attrdef-link-type
https://www.w3.org/TR/html/#element-attrdef-embed-type
https://www.w3.org/TR/html/#element-attrdef-object-type
https://www.w3.org/TR/html/#element-attrdef-script-type
https://www.w3.org/TR/html/#element-attrdef-ol-type
https://www.w3.org/TR/html/#element-attrdef-button-value
https://www.w3.org/TR/html/#element-attrdef-option-value
https://www.w3.org/TR/html/#element-attrdef-li-value
https://www.w3.org/TR/html/#element-attrdef-param-value
https://www.w3.org/TR/html/#element-attrdef-canvas-width
https://www.w3.org/TR/html/#element-attrdef-media-width
https://www.w3.org/TR/html/#tabular-data
https://www.w3.org/TR/graphics-aam-1.0/#role-map-graphics-document
https://w3c.github.io/html/interactive-elements.html#element-attrdef-dialog-open

MediaStream Image Capture
Links to anchors that don't exist:

https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-kind
https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-readyState
https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-onmute
https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-onunmute
https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-getCapabilities-MediaTrackCapabilities
https://www.w3.org/TR/mediacapture-streams/#widl-ConstrainablePattern-getSettings-Settings
https://www.w3.org/TR/mediacapture-streams/#widl-MediaStreamTrack-getConstraints-MediaTrackConstraints
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackSupportedConstraints
https://www.w3.org/TR/mediacapture-streams/#widl-MediaDevices-getSupportedConstraints-MediaTrackSupportedConstraints
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackCapabilities
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackConstraintSet
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackSettings
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackConstraints
https://www.w3.org/TR/mediacapture-streams/#idl-def-ConstrainBoolean

Intersection Observer
Links to anchors that don't exist:

https://www.w3.org/TR/hr-time/#domhighrestimestamp
https://www.w3.org/TR/hr-time/#time-origin

Media Capabilities
Links to anchors that don't exist:

https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/encrypted-media/#navigator-extension:-requestmediakeysystemaccess()

Media Capture Depth Stream Extensions
Links to anchors that don't exist:

https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaStream
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaStreamTrack
https://www.w3.org/TR/mediacapture-streams/#idl-def-ConstraintSet
https://www.w3.org/TR/mediacapture-streams/#idl-def-ConstrainDOMString
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackSettings
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackConstraints
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackSupportedConstraints
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackCapabilities
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaTrackConstraintSet
https://www.w3.org/TR/mediacapture-streams/#idl-def-MediaDeviceKind
https://heycam.github.io/webidl/#dfn-present

Media Capture and Streams
Links to anchors that don't exist:

https://heycam.github.io/webidl/#dfn-present

Media Session Standard
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#dom-imageresource

Motion Path Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-masking-1/#valuedef-margin-box0

Navigation Timing Level 2
Links to anchors that don't exist:

https://heycam.github.io/webidl/#default-tojson-operation

Network Error Logging
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-response-trailer
https://www.w3.org/TR/reporting-1/#endpoint-group
https://www.w3.org/TR/reporting-1/#visible-to-reporting-observers
https://url.spec.whatwg.org/#concept-URL

DeviceOrientation Event Specification
Links to anchors that don't exist:

https://html.spec.whatwg.org/#triggered-by-user-activation

Paint Timing 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#opacity
https://www.w3.org/TR/hr-time-2/#idl-def-domhighrestimestampdomhighrestimestamp

Payment Handler API
Links to anchors that don't exist:

https://www.w3.org/TR/service-workers-1/#service-worker-global-scope
https://www.w3.org/TR/service-workers-1/#dfn-extend-lifetime-promises
https://www.w3.org/TR/service-workers-1/#client-visibilitystate-attribute
https://www.w3.org/TR/service-workers-1/#dfn-pending-promises-count
https://www.w3.org/TR/service-workers-1/#dfn-uninstalling-flag
https://www.w3.org/TR/payment-request/#canmakepayment()-method
https://www.w3.org/TR/payment-request/#show()-method
https://www.w3.org/TR/payment-request/#dfn-json-serialize
https://html.spec.whatwg.org/#context-object
https://www.w3.org/TR/payment-method-basic-card/#dom-basiccardrequest-supportedtypes
https://www.w3.org/TR/appmanifest/#fetching-image-resources

Payment Method Manifest
Links to anchors that don't exist:

https://w3c.github.io/payment-request/#dfn-payment-apps
https://w3c.github.io/payment-method-id/#dfn-payment-method-identifiers
https://w3c.github.io/payment-method-id/#dfn-url-based-payment-method-identifiers
https://w3c.github.io/payment-method-id/#dfn-standardized-payment-method-identifiers
https://www.w3.org/TR/appmanifest/#dfn-manifest
https://www.w3.org/TR/appmanifest/#dfn-obtaining-the-manifest
https://infra.spec.whatwg.org/#parse-json-into-infra-values
https://fetch.spec.whatwg.org/#concept-get-reader
https://fetch.spec.whatwg.org/#concept-read-all-bytes-from-readablestream

Permissions
Links to anchors that don't exist:

https://w3c.github.io/manifest/#dfn-install
https://w3c.github.io/mediacapture-main/#deviceid
https://w3c.github.io/mediacapture-main/#devicechange
https://w3c.github.io/webdriver/#dfn-extension-commands
https://w3c.github.io/webdriver/#dfn-error
https://w3c.github.io/webdriver/#dfn-session
https://w3c.github.io/webdriver/#dfn-local-end

Pointer Events
Links to anchors that don't exist:

https://www.w3.org/TR/uievents/#widl-UIEvent-detail
https://www.w3.org/TR/pointerlock/#widl-MouseEvent-movementX
https://www.w3.org/TR/pointerlock/#widl-MouseEvent-movementY

Preload
Links to anchors that don't exist:

https://mimesniff.spec.whatwg.org/#parsable-mime-type

Proximity Sensor
Links to anchors that don't exist:

https://w3c.github.io/sensors/#sensor-readings

Push API
Links to anchors that don't exist:

https://www.w3.org/TR/secure-contexts/#secure-context

Referrer Policy
Links to anchors that don't exist:

https://html.spec.whatwg.org/#attr-a-referrerpolicy

Remote Playback API
Links to anchors that don't exist:

https://html.spec.whatwg.org/#allowed-to-show-a-popup

Reporting API 1
Links to anchors that don't exist:

https://html.spec.whatwg.org/#creation-url
https://fetch.spec.whatwg.org/#concept-response-https-state
https://fetch.spec.whatwg.org/#wait-for-a-response
https://w3c.github.io/webdriver/#dfn-error

Cooperative Scheduling of Background Tasks
Links to anchors that don't exist:

https://html.spec.whatwg.org/#dom-window-requestanimationframe

Resize Observer
Links to anchors that don't exist:

https://www.w3.org/TR/css3-positioning/#viewport

Resource Hints
Links to anchors that don't exist:

https://html.spec.whatwg.org/#resulting-absolute-url
https://w3c.github.io/webappsec-mixed-content/#category-optionally-blockable

Resource Timing Level 2
Links to anchors that don't exist:

https://html.spec.whatwg.org/#or-equivalent
https://html.spec.whatwg.org/#relevant-settings=object
https://heycam.github.io/webidl/#default-tojson-operation
https://www.w3.org/TR/beacon/#sec-sendBeacon-method

Screen Capture
Links to anchors that don't exist:

https://www.w3.org/TR/mediacapture-streams/#event-mediastreamtrack-overconstrained

Secure Contexts
Links to anchors that don't exist:

https://html.spec.whatwg.org/#https-state
https://www.w3.org/TR/geolocation-API/#get-current-position
https://www.w3.org/TR/geolocation-API/#watch-position

Selectors Level 4
Links to anchors that don't exist:

https://html.spec.whatwg.org/#a-form-control’s-value
https://www.w3.org/TR/css-scoping-1/#selectordef-shadow
https://www.w3.org/TR/css-scoping-1/#selectordef-content

Server Timing
Links to anchors that don't exist:

https://www.w3.org/TR/resource-timing-2/#performanceresourcetiming
https://www.w3.org/TR/resource-timing-2/#step-create-object

Service Workers Nightly
Links to anchors that don't exist:

https://w3c.github.io/push-api/#h-the-push-event
https://w3c.github.io/push-api/#dfn-push
https://w3c.github.io/push-api/#dfn-fire-the-push-event
https://www.w3.org/TR/page-visibility/#VisibilityState
https://wicg.github.io/BackgroundSync/spec/#sync

SVG Accessibility API Mappings
Links to anchors that don't exist:

https://w3c.github.io/core-aam/#exclude_elements2
https://w3c.github.io/core-aam/#include_elements
https://w3c.github.io/core-aam/#role-map-link
https://w3c.github.io/core-aam/#role-map-application
https://w3c.github.io/core-aam/#role-map-group
https://w3c.github.io/core-aam/#role-map-document
https://w3c.github.io/core-aam/#role-map-img
https://w3c.github.io/core-aam/#mapping_additional_widget-value
https://w3c.github.io/core-aam/#document-handling
https://w3c.github.io/graphics-aam/#role-map-graphics-symbol
https://w3c.github.io/graphics-aam/#role-map-graphics-document
https://w3c.github.io/graphics-aam/#role-map-graphics-object

SVG Markers
Links to anchors that don't exist:

https://www.w3.org/TR/geometry-1/#dom-dompoint
https://www.w3.org/TR/geometry-1/#dom-dompointreadonly

SVG Paths
Links to anchors that don't exist:

https://www.w3.org/TR/geometry-1/#dom-dompoint

Scalable Vector Graphics (SVG) 2
Links to anchors that don't exist:

https://html.spec.whatwg.org/#specially-focusable
https://www.w3.org/TR/geometry-1/#dom-dompoint
https://www.w3.org/TR/geometry-1/#dom-dompointreadonly
https://www.w3.org/TR/web-animations-1/#keyframeeffectreadonly
https://www.w3.org/TR/web-animations-1/#dom-keyframeeffectreadonly-target
https://www.w3.org/TR/css3-mediaqueries/#syntax
https://www.w3.org/TR/css-position-3/#vp
https://www.w3.org/TR/css-shapes/#basic-shape-interpolation
https://www.w3.org/TR/css-color-3/#colorunits
https://www.w3.org/TR/css-color-3/#svg-color
https://www.w3.org/TR/css-selectors-3/#the-user-action-pseudo-classes-hover-act

Touch Events - Level 2
Links to anchors that don't exist:

https://dom.spec.whatwg.org/#event-retargeting-steps

UI Events KeyboardEvent code Values
Links to anchors that don't exist:

https://www.w3.org/TR/uievents-key/#key-value-tables

UI Events
Links to anchors that don't exist:

https://www.w3.org/TR/uievents-key/#key-AltGr
https://www.w3.org/TR/uievents-key/#key-RomanCharacters
https://www.w3.org/TR/uievents-key/#key-FullWidth
https://www.w3.org/TR/uievents-key/#key-HalfWidth
https://www.w3.org/TR/uievents-key/#key-Nonconvert
https://www.w3.org/TR/uievents-code/#code-
https://html.spec.whatwg.org/#context-menus

Upgrade Insecure Requests
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-request-target-browsing-context

User Timing Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/hr-time-2/#dfn-performance
https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/navigation-timing/#performancetiming

User Timing Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/hr-time-2/#dfn-performance
https://heycam.github.io/webidl/#dfn-present
https://www.w3.org/TR/navigation-timing/#performancetiming

Vibration API (Second Edition)
Links to anchors that don't exist:

https://w3c.github.io/page-visibility/#dfn-steps-to-determine-the-visibility-state

Web Animations
Links to anchors that don't exist:

https://w3c.github.io/hr-time/#time-origin
https://w3c.github.io/hr-time/#domhighrestimestamp
https://heycam.github.io/webidl/#dfn-present

Web Audio API
Links to anchors that don't exist:

https://heycam.github.io/webidl/#dfn-present
https://w3c.github.io/mediacapture-fromelement/#dom-htmlmediaelement-capturestream()

Web Authentication: An API for accessing Public Key Credentials - Level 2
Links to anchors that don't exist:

https://w3c.github.io/webappsec-credential-management/#collectfromcredentialstore-origin-options-sameoriginwithancestors
https://w3c.github.io/webappsec-credential-management/#store-credential-sameoriginwithancestors
https://w3c.github.io/webappsec-credential-management/#create-origin-options-sameoriginwithancestors
https://url.spec.whatwg.org/#host-same-site
https://infra.spec.whatwg.org/#serialize-json-to-bytes
https://w3c.github.io/webdriver/#dfn-error

WebDriver
Links to anchors that don't exist:

https://html.spec.whatwg.org/#button-state-(type=button)
https://html.spec.whatwg.org/#checkbox-state-(type=checkbox)
https://html.spec.whatwg.org/#code-entry-point
https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#hidden-state-(type=hidden)
https://html.spec.whatwg.org/#image-button-state-(type=image)
https://html.spec.whatwg.org/#an-overridden-reload
https://html.spec.whatwg.org/#radio-button-state-(type=radio)
https://html.spec.whatwg.org/#submit-button-state-(type=submit)
https://html.spec.whatwg.org/#concept-output-mode
https://www.w3.org/TR/page-visibility/#visibility-states-and-the-visibilitystate-enum
https://www.w3.org/TR/geometry-1/#dom-domrect

Identity for WebRTC 1.0
Links to anchors that don't exist:

https://www.w3.org/TR/webrtc/#dom-rtcconfiguration-peeridentity
https://w3c.github.io/webrtc-pc/#dfn-create-an-offer
https://w3c.github.io/webrtc-pc/#dfn-create-an-answer

WebVTT: The Web Video Text Tracks Format
Links to anchors that don't exist:

https://html.spec.whatwg.org/#skip-whitespace
https://html.spec.whatwg.org/#rules-for-extracting-the-chapter-title
https://dom.spec.whatwg.org/#dom-node-namespaceuri

XMLHttpRequest Standard
Links to anchors that don't exist:

https://infra.spec.whatwg.org/#parse-json-from-bytes

A backrefs analyzer tool has now been added. It creates the following report. The analysis may be further improved, see "TODO" comments in the code. On top of that, it will be useful to consider mechanisms to generate these reports regularly (the tool is not included in the overall anomaly report), and raise issues automatically in the relevant repos.
 Report
A Well-Known URL for Changing Passwords
Links to definitions that are not exported:

https://html.spec.whatwg.org/#attr-meta-http-equiv-refresh

Accelerated Shape Detection in Images
Links to anchors that don't exist:

https://w3c.github.io/mediacapture-image/#Point2D

Links to definitions that are not exported:

https://html.spec.whatwg.org/#img-error
https://html.spec.whatwg.org/#concept-canvas-origin-clean
https://drafts.csswg.org/css2/conform.html#intrinsic

Links to specs that should no longer be referenced:

https://www.w3.org/TR/2dcontext/

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Accelerated Text Detection in Images
Links to anchors that don't exist:

https://w3c.github.io/mediacapture-image/#Point2D

Accelerometer
Links to definitions that are not exported:

https://w3c.github.io/sensors/#sensor-reading
https://w3c.github.io/sensors/#sensor-type
https://w3c.github.io/sensors/#latest-reading
https://w3c.github.io/sensors/#get-value-from-latest-reading
https://w3c.github.io/sensors/#mock-sensor-type
https://www.w3.org/TR/screen-orientation/#dom-screen
https://www.w3.org/TR/screen-orientation/#dfn-current-orientation-type

Accessible Name and Description Computation 1.2
Links to anchors that don't exist:

https://w3c.github.io/core-aam/#ariaLabel
https://w3c.github.io/core-aam/#ariaLabelledBy
https://w3c.github.io/core-aam/#ariaDescribedBy

Accessible Rich Internet Applications (WAI-ARIA) 1.2
Links to definitions that are not exported:

https://html.spec.whatwg.org/#enumerated-attribute
https://html.spec.whatwg.org/#missing-value-default
https://html.spec.whatwg.org/#invalid-value-default
https://html.spec.whatwg.org/#translatable-attributes
https://html.spec.whatwg.org/#reflect

Links to dated TR URLs:

https://www.w3.org/TR/2007/REC-xforms-20071029/
https://www.w3.org/TR/2006/REC-xml-names-20060816/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/role-attribute/
https://www.w3.org/TR/xmlschema11-2/
https://www.w3.org/TR/dpub-aria-1.0/
https://www.w3.org/TR/xml-names/

Ambient Light Sensor
Links to definitions that are not exported:

https://w3c.github.io/sensors/#high-level
https://w3c.github.io/sensors/#sensor-reading
https://w3c.github.io/sensors/#limit-max-frequency
https://w3c.github.io/sensors/#reduce-accuracy
https://w3c.github.io/sensors/#sensor-type
https://w3c.github.io/sensors/#get-value-from-latest-reading
https://w3c.github.io/sensors/#mock-sensor-type
https://w3c.github.io/sensors/#sampling-frequency

ARIA in HTML
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#unknown-images
https://html.spec.whatwg.org/#e-mail-state-(type=email)

Links to definitions that are not exported:

https://html.spec.whatwg.org/#button-state-(type=button)
https://html.spec.whatwg.org/#checkbox-state-(type=checkbox)
https://html.spec.whatwg.org/#color-state-(type=color)
https://html.spec.whatwg.org/#date-state-(type=date)
https://html.spec.whatwg.org/#local-date-and-time-state-(type=datetime-local)
https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#hidden-state-(type=hidden)
https://html.spec.whatwg.org/#image-button-state-(type=image)
https://html.spec.whatwg.org/#month-state-(type=month)
https://html.spec.whatwg.org/#password-state-(type=password)
https://html.spec.whatwg.org/#radio-button-state-(type=radio)
https://html.spec.whatwg.org/#range-state-(type=range)
https://html.spec.whatwg.org/#reset-button-state-(type=reset)
https://html.spec.whatwg.org/#text-(type=text)-state-and-search-state-(type=search)
https://html.spec.whatwg.org/#submit-button-state-(type=submit)
https://html.spec.whatwg.org/#telephone-state-(type=tel)
https://html.spec.whatwg.org/#url-state-(type=url)
https://html.spec.whatwg.org/#time-state-(type=time)
https://html.spec.whatwg.org/#week-state-(type=week)
https://html.spec.whatwg.org/#candidate-for-constraint-validation
https://html.spec.whatwg.org/#concept-fv-valid
https://html.spec.whatwg.org/#category-submit
https://html.spec.whatwg.org/#lowercase-ascii-letters
https://html.spec.whatwg.org/#interactive-content-2
https://html.spec.whatwg.org/#sectioning-content-2
https://html.spec.whatwg.org/#sectioning-root
https://www.w3.org/TR/html-aam-1.0/#dfn-accessible-name

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/dpub-aria-1.0/

Audio Output Devices API
Links to anchors that don't exist:

https://html.spec.whatwg.org/#triggered-by-user-activation

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/mediacapture-streams/#def-mediadeviceinfo-groupId

Links to definitions that are not exported:

https://www.w3.org/TR/mediacapture-streams/#event-mediadevices-devicechange
https://www.w3.org/TR/mediacapture-streams/#device-exposure-decision-non-camera-microphone

Background Fetch
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-cancel-readablestream
https://fetch.spec.whatwg.org/#concept-readablestream-errored
https://fetch.spec.whatwg.org/#concept-construct-readablestream
https://fetch.spec.whatwg.org/#concept-enqueue-readablestream
https://fetch.spec.whatwg.org/#concept-readablestream-closed
https://fetch.spec.whatwg.org/#concept-readablestream-readable

Links to definitions that are not exported:

https://w3c.github.io/image-resource/#dfn-src
https://w3c.github.io/webdriver/#dfn-extension-command
https://w3c.github.io/webdriver/#dfn-extension-command-uri-template
https://w3c.github.io/webdriver/#dfn-remote-end-steps
https://w3c.github.io/webdriver/#dfn-current-top-level-browsing-context
https://w3c.github.io/webdriver/#dfn-no-longer-open
https://w3c.github.io/webdriver/#dfn-errors
https://w3c.github.io/webdriver/#dfn-error-code
https://w3c.github.io/webdriver/#dfn-no-such-window
https://w3c.github.io/webdriver/#dfn-url-variables
https://w3c.github.io/webdriver/#dfn-success

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Badging API
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#dfn-within-scope-manifest

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/ltli/

Battery Status API
Links to anchors that don't exist:

https://wicg.github.io/feature-policy/#feature-name

Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/secure-contexts/#secure-context

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Beacon
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/page-visibility-2/#dfn-visibilitychange
https://www.w3.org/TR/page-visibility-2/#dfn-unload

Links to anchors that are not definitions or headings:

https://fetch.spec.whatwg.org/#keep-alive-flag

Links to definitions that are not exported:

https://html.spec.whatwg.org/#entry-settings-object

Clear Site Data
Links to anchors that don't exist:

https://html.spec.whatwg.org/#application-cache
https://html.spec.whatwg.org/#application-cache-group

Links to definitions that are not exported:

https://fetch.spec.whatwg.org/#concept-http-network-fetch
https://w3c.github.io/IndexedDB/#database
https://w3c.github.io/IndexedDB/#delete-a-database

Client Hints Infrastructure
Links to anchors that don't exist:

https://wicg.github.io/ua-client-hints/#sec-ch-ua-mobile
https://wicg.github.io/ua-client-hints/#sec-ch-ua-arch
https://wicg.github.io/ua-client-hints/#sec-ch-ua-model
https://wicg.github.io/ua-client-hints/#sec-ch-ua-platform

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-request-origin
https://html.spec.whatwg.org/#meta
https://html.spec.whatwg.org/#initialise-the-document-object
https://html.spec.whatwg.org/#set-up-a-worker-environment-settings-object

Clipboard API and events
Links to anchors that don't exist:

https://html.spec.whatwg.org/#drag-data-item-kind
https://html.spec.whatwg.org/#drag-data-item-type-string
https://w3c.github.io/FileAPI/#dfn-blobparts

Links to definitions that are not exported:

https://html.spec.whatwg.org/#focusable-area
https://html.spec.whatwg.org/#drag-data-store-mode
https://html.spec.whatwg.org/#concept-dnd-ro
https://html.spec.whatwg.org/#the-body-element-2
https://html.spec.whatwg.org/#concept-dnd-rw
https://html.spec.whatwg.org/#concept-dnd-p

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Links to things that look like specs but that aren't recognized in reffy data:

https://w3c.github.io/editing/contentEditable.html
https://tc39.github.io/ecma262/

Compatibility Standard
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color
https://drafts.csswg.org/css-transitions/#animtype-color

Links to definitions that are not exported:

https://w3c.github.io/screen-orientation/#dfn-update-the-orientation-information

Links to dated TR URLs:

https://www.w3.org/TR/2011/WD-css3-images-20110217/

Compositing and Blending Level 1
Links to dated TR URLs:

https://www.w3.org/TR/2003/REC-SVG11-20030114/
https://www.w3.org/TR/2011/REC-SVG11-20110816/

Compositing and Blending Level 2
Links to dated TR URLs:

https://www.w3.org/TR/2003/REC-SVG11-20030114/
https://www.w3.org/TR/2011/REC-SVG11-20110816/
https://www.w3.org/TR/2014/CR-compositing-1-20140220/
https://www.w3.org/TR/2013/WD-compositing-1-20131010/
https://www.w3.org/TR/2013/WD-compositing-1-20130625/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/2dcontext2/
https://www.w3.org/TR/2dcontext/

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css21/visuren.html

Console Standard
Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Constructable Stylesheet Objects
Links to definitions that are not exported:

https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-location
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-parent-css-style-sheet
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-owner-node
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-owner-css-rule
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-title
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-alternate-flag
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-origin-clean-flag
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-media
https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-disabled-flag

Contact Picker API
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context
https://html.spec.whatwg.org/#triggered-by-user-activation

Links to definitions that are not exported:

https://html.spec.whatwg.org/#valid-e-mail-address

Content Index
Links to anchors that don't exist:

https://html.spec.whatwg.org/#replacement-enabled

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-location-ancestor-origins-list
https://w3c.github.io/image-resource/#dfn-src

Content Security Policy Level 3
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-request-target-browsing-context
https://w3c.github.io/reporting/#group

Links to definitions that are not exported:

https://html.spec.whatwg.org/#script
https://html.spec.whatwg.org/#concept-request-origin
https://html.spec.whatwg.org/#meta
https://html.spec.whatwg.org/#process-the-iframe-attributes
https://html.spec.whatwg.org/#plugin-document
https://html.spec.whatwg.org/#parse-error-duplicate-attribute
https://html.spec.whatwg.org/#parse-errors
https://fetch.spec.whatwg.org/#concept-main-fetch
https://fetch.spec.whatwg.org/#concept-http-network-fetch
https://url.spec.whatwg.org/#concept-base-url
https://url.spec.whatwg.org/#default-port
https://w3c.github.io/reporting/#visible-to-reportingobservers

Links to specs that should no longer be referenced:

https://www.w3.org/TR/worklets-1/
https://www.w3.org/TR/eventsource/
https://www.w3.org/TR/websockets/

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262
https://tc39.github.io/ecma262/
https://www.w3.org/TR/xslt/

Content Security Policy: Embedded Enforcement
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context
https://w3c.github.io/webappsec-csp/#port-part-match

Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#case-sensitive

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-element-attributes

Cookie Store API
Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Cooperative Scheduling of Background Tasks
Links to anchors that don't exist:

https://html.spec.whatwg.org/#dom-window-requestanimationframe

Links to definitions that are not exported:

https://html.spec.whatwg.org/#event-loop-processing-model
https://html.spec.whatwg.org/#spin-the-event-loop
https://html.spec.whatwg.org/#task-queue
https://html.spec.whatwg.org/#microtask-queue
https://html.spec.whatwg.org/#report-the-error

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CORS and RFC1918
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#document

Links to definitions that are not exported:

https://fetch.spec.whatwg.org/#cors-preflight-fetch-0
https://fetch.spec.whatwg.org/#concept-cache
https://fetch.spec.whatwg.org/#concept-websocket-establish
https://html.spec.whatwg.org/#meta

Credential Management Level 1
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context

Links to definitions that are not exported:

https://html.spec.whatwg.org/#attr-fe-autocomplete-username
https://html.spec.whatwg.org/#attr-fe-autocomplete-current-password
https://html.spec.whatwg.org/#attr-fe-autocomplete-new-password
https://html.spec.whatwg.org/#category-submit
https://html.spec.whatwg.org/#form-owner
https://html.spec.whatwg.org/#autofill-detail-tokens
https://html.spec.whatwg.org/#attr-fe-autocomplete-photo
https://html.spec.whatwg.org/#attr-fe-autocomplete-name
https://html.spec.whatwg.org/#attr-fe-autocomplete-nickname

Links to specs that should no longer be referenced:

https://www.w3.org/TR/webmessaging/

Links to things that look like specs but that aren't recognized in reffy data:

https://w3c.github.io/webappsec/usecases/credentialmanagement/
https://tc39.github.io/ecma262/

CSS 2
Links to dated TR URLs:

https://www.w3.org/TR/2008/REC-CSS2-20080411/
https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2003/REC-SVG11-20030114/
https://www.w3.org/TR/1998/REC-CSS2-19980512/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/html401/
https://www.w3.org/TR/xml/
https://www.w3.org/TR/xhtml1/
https://www.w3.org/TR/xml-id/
https://www.w3.org/TR/xml-names/

CSS 2
Links to dated TR URLs:

https://www.w3.org/TR/2008/REC-CSS2-20080411/
https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2003/REC-SVG11-20030114/
https://www.w3.org/TR/1998/REC-CSS2-19980512/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/html401/
https://www.w3.org/TR/xml/
https://www.w3.org/TR/xhtml1/
https://www.w3.org/TR/xml-id/
https://www.w3.org/TR/xml-names/

CSS Animation Worklet API
Links to anchors that don't exist:

https://drafts.csswg.org/web-animations#timing-function
https://drafts.csswg.org/web-animations#inherited-time
https://drafts.csswg.org/web-animations#set-the-target-effect-of-an-animation
https://drafts.csswg.org/web-animations#idle
https://drafts.csswg.org/web-animations#finished
https://drafts.csswg.org/web-animations#running
https://drafts.csswg.org/web-animations#paused
https://drafts.csswg.org/web-animations#active
https://drafts.csswg.org/web-animations#persisted
https://drafts.csswg.org/web-animations#removed
https://w3c.github.io/web-animations/level-2/#group-effect
https://w3c.github.io/web-animations/level-2/#child-effect

Links to definitions that are not exported:

https://drafts.csswg.org/web-animations#animation-effect
https://drafts.csswg.org/web-animations#concept-animation
https://drafts.csswg.org/web-animations#local-time
https://drafts.csswg.org/web-animations#start-delay
https://drafts.csswg.org/web-animations#end-delay
https://drafts.csswg.org/web-animations#fill-mode
https://drafts.csswg.org/web-animations#iteration-start
https://drafts.csswg.org/web-animations#iteration-count
https://drafts.csswg.org/web-animations#iteration-duration
https://drafts.csswg.org/web-animations#playback-direction
https://drafts.csswg.org/web-animations#current-time
https://drafts.csswg.org/web-animations#play-state
https://drafts.csswg.org/web-animations#set-the-timeline-of-an-animation
https://drafts.csswg.org/web-animations#playback-rate
https://drafts.csswg.org/web-animations#effect-value
https://drafts.csswg.org/web-animations#target-property
https://drafts.csswg.org/web-animations#ready
https://drafts.csswg.org/web-animations#replace-state
https://drafts.csswg.org/web-animations#set-the-current-time
https://drafts.csswg.org/web-animations#set-the-start-time
https://drafts.csswg.org/web-animations#update-the-timing-properties-of-an-animation-effect
https://drafts.csswg.org/web-animations#effect-stack
https://drafts.csswg.org/web-animations#animation-class
https://html.spec.whatwg.org/#run-the-animation-frame-callbacks

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

CSS Animations Level 1
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/cssom-1/#cssstyledeclaration-readonly-flag

Links to definitions that are not exported:

https://drafts.csswg.org/css-easing-1/#input-progress-value
https://drafts.csswg.org/css-easing-1/#step-easing-function
https://drafts.csswg.org/css-easing-1/#step-position
https://drafts.csswg.org/css-easing-1/#output-progress-value
https://drafts.csswg.org/cssom-1/#concept-declarations-specified-order

CSS Animations Level 2
Links to anchors that don't exist:

https://drafts.csswg.org/web-animations-1/#target-effect
https://drafts.csswg.org/web-animations-1/#target-effect-end
https://drafts.csswg.org/web-animations-1/#sampling
https://drafts.csswg.org/web-animations-1/#pending-play-state

Links to definitions that are not exported:

https://drafts.csswg.org/web-animations-1/#play-state
https://drafts.csswg.org/web-animations-1/#paused-play-state
https://drafts.csswg.org/web-animations-1/#target-element
https://drafts.csswg.org/web-animations-1/#animation-class
https://drafts.csswg.org/web-animations-1/#global-animation-list
https://drafts.csswg.org/web-animations-1/#idle-play-state
https://drafts.csswg.org/web-animations-1/#keyframe
https://drafts.csswg.org/web-animations-1/#iteration-duration
https://drafts.csswg.org/web-animations-1/#animation-effect
https://drafts.csswg.org/web-animations-1/#iteration-count
https://drafts.csswg.org/web-animations-1/#playback-direction
https://drafts.csswg.org/web-animations-1/#play-an-animation
https://drafts.csswg.org/web-animations-1/#pause-an-animation
https://drafts.csswg.org/web-animations-1/#start-delay
https://drafts.csswg.org/web-animations-1/#fill-mode
https://drafts.csswg.org/web-animations-1/#composite-operation
https://drafts.csswg.org/web-animations-1/#before-phase
https://drafts.csswg.org/web-animations-1/#idle-phase
https://drafts.csswg.org/web-animations-1/#current-time
https://drafts.csswg.org/web-animations-1/#unresolved
https://drafts.csswg.org/web-animations-1/#after-phase
https://drafts.csswg.org/web-animations-1/#active-duration
https://drafts.csswg.org/web-animations-1/#current-iteration
https://drafts.csswg.org/web-animations-1/#iteration-start
https://drafts.csswg.org/web-animations-1/#active-phase
https://drafts.csswg.org/web-animations-1/#active-time

CSS Backgrounds and Borders Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-box-3/#the-css-box-model
https://www.w3.org/TR/css3-transitions/#animatable-types
https://drafts.csswg.org/css-color-3/#valuea-def-color
https://drafts.csswg.org/css-color-3/#color0
https://www.w3.org/TR/css3-images/#default-sizing
https://drafts.csswg.org/selectors-3/#sel-first-line
https://drafts.csswg.org/selectors-3/#first-letter0
https://www.w3.org/TR/css3-color/#currentcolor

Links to dated TR URLs:

https://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/F3
https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2014/CR-css3-background-20140909/
https://www.w3.org/TR/2014/WD-css3-background-20140204/
https://www.w3.org/TR/2012/CR-css3-background-20120724/
https://www.w3.org/TR/2012/CR-css3-background-20120417/
https://www.w3.org/TR/2012/WD-css3-background-20120214/
https://www.w3.org/TR/2011/CR-css3-background-20110215/
https://www.w3.org/TR/2009/CR-css3-background-20091217/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/media-frags/
https://www.w3.org/TR/xml11/

CSS Backgrounds and Borders Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color
https://www.w3.org/TR/css3-transitions/#animtype-color

CSS Basic User Interface Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color
https://w3c.github.io/contentEditable/#dfn-editing-host

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-backgrounds-3/#the-border-width
https://www.w3.org/TR/css-backgrounds-3/#the-border-style
https://www.w3.org/TR/css-backgrounds-3/#the-border-radius

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-fe-mutable
https://www.w3.org/TR/css-style-attr/#style-attribute

Links to dated TR URLs:

https://www.w3.org/TR/2000/WD-css3-userint-20000216

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CSS Box Alignment Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/selectors-3/#first-formatted-line0

Links to definitions that are not exported:

https://drafts.csswg.org/css2/#line-box
https://drafts.csswg.org/css-grid-1/#collapsed-gutter
https://drafts.csswg.org/css-writing-modes-3/#dominant-baseline

CSS Box Model Module Level 3
Links to dated TR URLs:

https://www.w3.org/TR/2018/WD-css3-box-20180731/

CSS Box Model Module Level 4
Links to dated TR URLs:

https://www.w3.org/TR/2018/WD-css3-box-20180731/

CSS Box Sizing Module Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-ui-3/#box-sizing

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-textarea-raw-value
https://html.spec.whatwg.org/#concept-fe-value

CSS Box Sizing Module Level 4
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-flexbox-1/#algo-main-item

CSS Cascading and Inheritance Level 3
Links to definitions that are not exported:

https://html.spec.whatwg.org/#content-type
https://html.spec.whatwg.org/#quirks-mode

Links to dated TR URLs:

https://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/

CSS Cascading and Inheritance Level 4
Links to definitions that are not exported:

https://html.spec.whatwg.org/#content-type
https://html.spec.whatwg.org/#quirks-mode

Links to dated TR URLs:

https://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/

CSS Cascading and Inheritance Level 5
Links to definitions that are not exported:

https://html.spec.whatwg.org/#content-type
https://html.spec.whatwg.org/#quirks-mode

CSS Color Adjustment Module Level 1
Links to definitions that are not exported:

https://drafts.csswg.org/css-color-4/#css-system-colors
https://drafts.csswg.org/css2/#canvas
https://www.w3.org/TR/css-color-4/#css-system-colors
https://html.spec.whatwg.org/#meta-color-scheme
https://html.spec.whatwg.org/#meta

CSS Color Module Level 4
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-values-3/#typedef-number-percentage

CSS Containment Module Level 2
Links to anchors that are not definitions or headings:

https://drafts.csswg.org/css-ui-3/#propdef-text-overflow

Links to definitions that are not exported:

https://drafts.csswg.org/css-break-3/#monolithic
https://drafts.csswg.org/css2/#stacking-context
https://w3c.github.io/IntersectionObserver/#intersectionobserver-intersection-root

CSS Counter Styles Level 3
Links to definitions that are not exported:

https://drafts.csswg.org/css-text-3/#grapheme-cluster

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css4-images/

CSS Custom Highlight API Module Level 1
Links to definitions that are not exported:

https://drafts.csswg.org/css-pseudo-4/#highlight-overlay

CSS Custom Properties for Cascading Variables Module Level 1
Links to definitions that are not exported:

https://drafts.csswg.org/cssom-1/#css-declaration-case-sensitive-flag

CSS Device Adaptation Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-syntax/#property-defs

Links to dated TR URLs:

https://www.w3.org/TR/2011/WD-css-device-adapt-20110915/

CSS Display Module Level 3
Links to definitions that are not exported:

https://html.spec.whatwg.org/#rendered-legend

CSS Exclusions Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css-shapes/#20120503

CSS Extensions
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

CSS Fill and Stroke Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#valuea-def-color

CSS Flexible Box Layout Module Level 1
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css3-break/#btw-blocks
https://www.w3.org/TR/css3-break/#end-block

Links to dated TR URLs:

https://www.w3.org/TR/2012/CR-css3-flexbox-20120918/

CSS Font Loading Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/css-fonts-3/#descdef-src

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CSS Fonts Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to definitions that are not exported:

https://drafts.csswg.org/css-inline-3/#ascent-metric
https://drafts.csswg.org/css-inline-3/#descent-metric
https://drafts.csswg.org/css-inline-3/#line-gap-metric

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/charmod-norm/

CSS Fragmentation Module Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css3-page/#left-right-first

Links to definitions that are not exported:

https://www.w3.org/TR/css3-background/#background-positioning-area

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2015/WD-css3-break-20150129/

CSS Fragmentation Module Level 4
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-page-3/#left-right-first

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-CSS2-20110607/

CSS Generated Content for Paged Media Module
Links to anchors that don't exist:

https://www.w3.org/TR/css3-selectors/#first-letter
https://drafts.csswg.org/css-color/#cmyk-colors
https://drafts.csswg.org/css-overflow-3/#paginated-overflow

Links to dated TR URLs:

https://www.w3.org/TR/2014/WD-dpub-latinreq-20140313/
https://www.w3.org/TR/2011/WD-css3-gcpm-20111129/

CSS Generated Content for Paged Media Module Level 4
Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css-page-template-1/

CSS Grid Layout Module Level 2
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-writing-modes-3/#start
https://www.w3.org/TR/css-writing-modes-3/#end

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-syntax-3/#name-code-point
https://www.w3.org/TR/css3-break/#btw-blocks
https://www.w3.org/TR/css3-break/#end-block

CSS Grid Layout Module Level 3
Links to definitions that are not exported:

https://drafts.csswg.org/css-grid-2/#computed-track-list

CSS Images Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css3-background/#the-background-size
https://www.w3.org/TR/css3-background/#the-border-image-slice

Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-imagebitmap-good
https://www.w3.org/TR/css3-background/#border-image-area

Links to dated TR URLs:

https://www.w3.org/TR/2012/CR-css3-images-20120417/
https://www.w3.org/TR/1998/REC-smil-19980615/

CSS Images Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to definitions that are not exported:

https://drafts.csswg.org/css2/#stacking-context

Links to dated TR URLs:

https://www.w3.org/TR/2011/CR-css3-background-20110215/
https://www.w3.org/TR/2012/WD-css4-images-20120911/
https://www.w3.org/TR/1998/REC-smil-19980615/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/media-frags/

CSS Inline Layout Module Level 3
Links to definitions that are not exported:

https://drafts.csswg.org/css-break-3/#monolithic
https://drafts.csswg.org/css-text-3/#hang
https://drafts.csswg.org/css-text-3/#word-separator

CSS Layout API Level 1
Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

CSS Line Grid Module Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-inline/#central

Links to definitions that are not exported:

https://drafts.csswg.org/css-inline/#text-over-edge
https://drafts.csswg.org/css-inline/#text-under-edge

CSS Logical Properties and Values Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

CSS Masking Module Level 1
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-values-3/#typedef-number-percentage

Links to definitions that are not exported:

https://drafts.csswg.org/css-backgrounds-3/#background-painting-area
https://drafts.csswg.org/css-backgrounds-3/#background-positioning-area
https://drafts.csswg.org/css-backgrounds-3/#border-image-area

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-SVG11-20110816/
https://www.w3.org/TR/2013/WD-css-masking-20130620/
https://www.w3.org/TR/2012/WD-css-masking-20121115/

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.fxtf.org/masking/

CSS Multi-column Layout Module Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to dated TR URLs:

https://www.w3.org/TR/2011/CR-css3-multicol-20110412/

CSS Namespaces Module Level 3
Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-css3-namespace-20110929/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/xml-names/

CSS Object Model (CSSOM)
Links to anchors that don't exist:

https://drafts.csswg.org/selectors-3/#sel-before
https://drafts.csswg.org/selectors-3/#sel-after
https://html.spec.whatwg.org/#style-sheet-ready
https://drafts.csswg.org/css-fonts-4/#cssfontfeaturevaluesrule①
https://drafts.csswg.org/css-color-3/#valuea-def-color
https://drafts.csswg.org/css-color-3/#alphavalue-def

Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#the-style-element:concept-css-style-sheet-title
https://html.spec.whatwg.org/#a-style-sheet-that-is-blocking-scripts

Links to definitions that are not exported:

https://html.spec.whatwg.org/#tree-order
https://html.spec.whatwg.org/#ascii-case-insensitive
https://html.spec.whatwg.org/#content-type
https://html.spec.whatwg.org/#being-rendered

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/xml-stylesheet/
https://www.w3.org/TR/xml/

CSS Overflow Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-backgrounds/#box-shadow

Links to definitions that are not exported:

https://drafts.csswg.org/css-transforms-2/#3d-rendering-context

CSS Overflow Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/selectors-3/#subject
https://www.w3.org/TR/css3-transitions/#animatable-types

CSS Overscroll Behavior Module Level 1
Links to definitions that are not exported:

https://www.w3.org/TR/uievents/#default-action
https://drafts.csswg.org/cssom-view/#viewport

CSS Page Floats
Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css-exclusions-1/

CSS Paged Media Module Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css3-break/#btw-blocks

Links to definitions that are not exported:

https://drafts.csswg.org/css-backgrounds-3/#background-positioning-area

Links to dated TR URLs:

https://www.w3.org/TR/2013/WD-css3-page-20130314/

CSS Painting API Level 1
Links to definitions that are not exported:

https://html.spec.whatwg.org/#concept-canvas-set-bitmap-dimensions
https://html.spec.whatwg.org/#reset-the-rendering-context-to-its-default-state
https://heycam.github.io/webidl/#web-idl-arguments-list-converting

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

CSS Positioned Layout Module Level 3
Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-backgrounds-3/#the-background-attachment

CSS Properties and Values API Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-syntax-3/#consume-a-name
https://www.w3.org/TR/cssom-1/#css

Links to definitions that are not exported:

https://drafts.csswg.org/css-syntax-3/#input-stream
https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-identifier

CSS Pseudo-Elements Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#color0
https://drafts.csswg.org/selectors-3/#x
https://www.w3.org/TR/css-color-3/#currentcolor-def

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CSS Regions Module Level 1
Links to anchors that are not definitions or headings:

https://drafts.csswg.org/css3-multicol/#multi-column-element

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-CSS2-20110607/
https://www.w3.org/TR/2012/WD-dom-20120405/
https://www.w3.org/TR/2014/WD-css3-regions-20140218/
https://www.w3.org/TR/2013/WD-css3-regions-20130528/
https://www.w3.org/TR/2012/WD-css3-regions-20120823/
https://www.w3.org/TR/2012/WD-css3-regions-20120503/

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css3-page-template/
https://drafts.csswg.org/css-page-template-1/

CSS Ruby Layout Module Level 1
Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/ruby/

CSS Scoping Module Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/selectors-3/#x

CSS Scroll Anchoring Module Level 1
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#processing-model-8

Links to definitions that are not exported:

https://html.spec.whatwg.org/#dom-anchor
https://html.spec.whatwg.org/#focused-area-of-the-document
https://html.spec.whatwg.org/#concept-fe-mutable
https://html.spec.whatwg.org/#fip-active-match

Links to things that look like specs but that aren't recognized in reffy data:

https://w3c.github.io/editing/docs/execCommand/
https://tabatkins.github.io/specs/css-sticky-scrollbars/

CSS Scrollbars Module Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color

CSS Shadow Parts
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/selectors-4/#live-profile

Links to definitions that are not exported:

https://drafts.csswg.org/selectors-4/#structural-pseudo-classes

CSS Shapes Module Level 1
Links to anchors that don't exist:

https://www.w3.org/TR/css3-transitions/#animatable-types
https://www.w3.org/TR/css3-transitions/#animtype-simple-list
https://www.w3.org/TR/css3-transitions/#animtype-lpcalc
https://www.w3.org/TR/css-box-3/#the-css-box-model

Links to dated TR URLs:

https://www.w3.org/TR/2012/WD-css3-exclusions-20120503/
https://www.w3.org/TR/2011/WD-css3-exclusions-20111213/

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CSS Shapes Module Level 2
Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-shapes-1/#typedef-fill-rule

CSS Spatial Navigation Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css2/box.html#x14

Links to definitions that are not exported:

https://w3c.github.io/uievents/#keydown
https://w3c.github.io/uievents/#event-target
https://html.spec.whatwg.org/#the-body-element-2
https://html.spec.whatwg.org/#concept-request-origin
https://html.spec.whatwg.org/#focusable-area
https://html.spec.whatwg.org/#sequential-focus-navigation-starting-point
https://html.spec.whatwg.org/#dom-anchor
https://html.spec.whatwg.org/#currently-focused-area-of-a-top-level-browsing-context
https://html.spec.whatwg.org/#concept-element-disabled
https://html.spec.whatwg.org/#expressly-inert
https://html.spec.whatwg.org/#being-rendered
https://html.spec.whatwg.org/#nodes-are-removed
https://html.spec.whatwg.org/#sequential-focus-navigation-order
https://drafts.csswg.org/cssom-view-1/#scroll-an-element

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css-overscroll-behavior-1/

CSS Speech Module Level 1
Links to dated TR URLs:

https://www.w3.org/TR/2012/CR-css3-speech-20120320/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/speech-synthesis11/
https://www.w3.org/TR/xml11/
https://www.w3.org/TR/pronunciation-lexicon/

CSS Style Attributes
Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-CSS2-20110607
https://www.w3.org/TR/1999/REC-html401-19991224
https://www.w3.org/TR/2011/REC-SVG11-20110816/

CSS Syntax Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#color0
https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to definitions that are not exported:

https://html.spec.whatwg.org/#link-type-stylesheet

Links to specs that should no longer be referenced:

https://www.w3.org/TR/selectors-api/

CSS Table Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/css-transforms/#grouping-property-values

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

CSS Text Decoration Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-color-3/#valuea-def-color
https://www.w3.org/TR/css-color-3/#color0

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-backgrounds-3/#the-border-style

Links to definitions that are not exported:

https://www.w3.org/TR/css-text-3/#grapheme-cluster
https://www.w3.org/TR/css-text-3/#letter
https://www.w3.org/TR/css-text-3/#word-separator

Links to dated TR URLs:

https://www.w3.org/TR/1998/REC-CSS2-19980512

CSS Text Decoration Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#color0
https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-backgrounds-3/#the-border-style

Links to definitions that are not exported:

https://www.w3.org/TR/css-text-3/#word-separator
https://www.w3.org/TR/css-text/#word-separator

Links to dated TR URLs:

https://www.w3.org/TR/1998/REC-CSS2-19980512

CSS Text Module Level 3
Links to anchors that don't exist:

https://www.w3.org/TR/css-fonts-3/#feature-precedence

Links to anchors that are not definitions or headings:

https://www.w3.org/TR/css-writing-modes-3/#text-combine-horizontal

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/css-text-decoration/
https://www.w3.org/TR/xml/

CSS Text Module Level 4
Links to definitions that are not exported:

https://drafts.csswg.org/css-text-3/#word-separator
https://drafts.csswg.org/css-text-3/#other-space-separators

CSS Transforms Module Level 1
Links to dated TR URLs:

https://www.w3.org/TR/2009/WD-css3-2d-transforms-20090320/
https://www.w3.org/TR/2009/WD-SVG-Transforms-20090320/
https://www.w3.org/TR/2011/REC-SVG11-20110816/

CSS Transforms Module Level 2
Links to definitions that are not exported:

https://drafts.csswg.org/css-transforms-1/#reference-box
https://drafts.csswg.org/css2/#stacking-context

CSS Transitions
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#opacity

Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#document

Links to definitions that are not exported:

https://drafts.csswg.org/css-easing-1/#input-progress-value
https://drafts.csswg.org/css-easing-1/#output-progress-value
https://html.spec.whatwg.org/#concept-event-dispatch

Links to dated TR URLs:

https://www.w3.org/TR/2013/WD-css3-transitions-20131119/
https://www.w3.org/TR/2013/WD-css3-transitions-20130212/ChangeLog

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/smil-animation/

CSS Transitions Level 2
Links to anchors that don't exist:

https://drafts.csswg.org/web-animations/#sampling
https://drafts.csswg.org/web-animations/#target-effect
https://drafts.csswg.org/web-animations/#pending-play-state
https://drafts.csswg.org/web-animations/#target-effect-end

Links to definitions that are not exported:

https://drafts.csswg.org/web-animations/#iteration-duration
https://drafts.csswg.org/web-animations/#animation-effect
https://drafts.csswg.org/web-animations/#start-delay
https://drafts.csswg.org/web-animations/#cancel-an-animation
https://drafts.csswg.org/web-animations/#animation-class
https://drafts.csswg.org/web-animations/#global-animation-list
https://drafts.csswg.org/web-animations/#idle-play-state
https://drafts.csswg.org/web-animations/#unresolved
https://drafts.csswg.org/web-animations/#current-time
https://drafts.csswg.org/web-animations/#active-duration
https://drafts.csswg.org/web-animations/#current-iteration
https://drafts.csswg.org/web-animations/#iteration-start
https://drafts.csswg.org/web-animations/#active-time
https://drafts.csswg.org/web-animations/#fill-mode
https://html.spec.whatwg.org/#being-rendered

CSS Typed OM Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-fonts-3/#absolute-size-value
https://drafts.csswg.org/css-fonts-3/#relative-size-value
https://drafts.csswg.org/css-color-3/#valuea-def-color

Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/css-values-3/#typedef-number-percentage

Links to anchors that are not definitions or headings:

https://drafts.fxtf.org/compositing-2/#propdef-mix

Links to definitions that are not exported:

https://drafts.csswg.org/cssom-1/#concept-css-style-sheet-origin-clean-flag
https://drafts.csswg.org/css-values-4/#relative-length
https://www.w3.org/TR/geometry-1/#dommatrixreadonly-stringification-behavior

Links to things that look like specs but that aren't recognized in reffy data:

https://drafts.csswg.org/css-preslev-1/

CSS Values and Units Module Level 3
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color
https://drafts.csswg.org/selectors-3/#x

Links to definitions that are not exported:

https://drafts.csswg.org/css-syntax-3/#consume-a-url-token

Links to dated TR URLs:

https://www.w3.org/TR/2013/CR-css3-values-20130730/
https://www.w3.org/TR/2012/CR-css3-values-20120828/
https://www.w3.org/TR/2013/CR-css3-values-20130404/

CSS Values and Units Module Level 4
Links to anchors that don't exist:

https://drafts.csswg.org/css-color-3/#valuea-def-color
https://www.w3.org/TR/css-values-3/#acknowledgements

Links to definitions that are not exported:

https://drafts.csswg.org/css-syntax-3/#consume-a-url-token
https://drafts.csswg.org/selectors-4/#typedef-wq-name

CSS Writing Modes Level 4
Links to dated TR URLs:

https://www.w3.org/TR/2015/CR-css-writing-modes-3-20151215/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/html401/

CSSOM View Module
Links to anchors that don't exist:

https://html.spec.whatwg.org/#responsible-browsing-context

Links to definitions that are not exported:

https://html.spec.whatwg.org/#familiar-with
https://html.spec.whatwg.org/#rules-for-parsing-integers
https://html.spec.whatwg.org/#live
https://dom.spec.whatwg.org/#event-listener-type
https://dom.spec.whatwg.org/#event-listener-callback
https://dom.spec.whatwg.org/#eventtarget-event-listener-list
https://dom.spec.whatwg.org/#event-listener-capture

Custom State Pseudo Class
Links to definitions that are not exported:

https://html.spec.whatwg.org/#internals-target
https://dom.spec.whatwg.org/#concept-dtl-update
https://dom.spec.whatwg.org/#concept-dtl-serialize

Deprecation Reporting
Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

DeviceOrientation Event Specification
Links to anchors that don't exist:

https://html.spec.whatwg.org/#triggered-by-user-activation

Links to definitions that are not exported:

https://compat.spec.whatwg.org/#event-orientationchange

DOM Parsing and Serialization
Links to anchors that don't exist:

https://www.w3.org/TR/dom/#case-sensitive
https://www.w3.org/TR/dom/#ascii-case-insensitive
https://www.w3.org/TR/dom/#domexception
https://www.w3.org/TR/dom/#invalidstateerror
https://www.w3.org/TR/dom/#nomodificationallowederror
https://www.w3.org/TR/dom/#syntaxerror

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/xml/
https://tc39.github.io/ecma262/

DOM Standard
Links to anchors that don't exist:

https://w3c.github.io/DOM-Parsing/#dfn-createcontextualfragment-fragment

Links to anchors that are not definitions or headings:

https://w3c.github.io/touch-events/#idl-def-touchevent

Links to definitions that are not exported:

https://html.spec.whatwg.org/#script

Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/xml/
https://www.w3.org/TR/xml-names/
https://tc39.github.io/ecma262/
https://www.w3.org/TR/xpath-10/

Early detection of input events
Links to anchors that don't exist:

https://heycam.github.io/webidl/#idl-Exposed

Links to definitions that are not exported:

https://html.spec.whatwg.org/#task-queue

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Element Timing API
Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#resolve-a-url

Links to definitions that are not exported:

https://html.spec.whatwg.org/#image-request
https://html.spec.whatwg.org/#list-of-available-images
https://html.spec.whatwg.org/#img-all
https://html.spec.whatwg.org/#event-loop-processing-model
https://w3c.github.io/performance-timeline/#dfn-queue-a-performanceentry
https://w3c.github.io/resource-timing/#dfn-timing-allow-check

Encoding Standard
Links to things that look like specs but that aren't recognized in reffy data:

https://www.w3.org/TR/xml/

Encrypted Media Extensions
Links to anchors that don't exist:

https://www.w3.org/TR/permissions-policy-1/#responsible-document
https://www.w3.org/TR/permissions-policy-1/#allowed-to-use
https://heycam.github.io/webidl/#dfn-present

Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/secure-contexts/#secure-context

Links to anchors that are not definitions or headings:

https://heycam.github.io/webidl/#dfn-DOMException

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html51/

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Event Timing API
Links to anchors that don't exist:

https://w3c.github.io/hr-time/#dfn-performance
https://html.spec.whatwg.org/#event-dnd-dragexit

Links to anchors that are not definitions or headings:

https://w3c.github.io/hr-time/#idl-def-domhighrestimestamp

Links to definitions that are not exported:

https://html.spec.whatwg.org/#event-loop-processing-model
https://w3c.github.io/performance-timeline/#dfn-queue-a-performanceentry
https://wicg.github.io/element-timing/#get-an-element
https://w3c.github.io/timing-entrytypes-registry/#dfn-should-add-entry

Fetch Metadata Request Headers
Links to definitions that are not exported:

https://fetch.spec.whatwg.org/#concept-main-fetch

Fetch Standard
Links to definitions that are not exported:

https://w3c.github.io/FileAPI/#readOperation

File and Directory Entries API
Links to definitions that are not exported:

https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#concept-input-type-file-selected
https://html.spec.whatwg.org/#drag-data-store
https://html.spec.whatwg.org/#drag-data-store-item-list
https://html.spec.whatwg.org/#concept-dnd-rw
https://html.spec.whatwg.org/#concept-dnd-ro
https://html.spec.whatwg.org/#the-drag-data-item-kind

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

File API
Links to anchors that don't exist:

https://fetch.spec.whatwg.org/#concept-construct-readablestream
https://fetch.spec.whatwg.org/#concept-error-readablestream
https://fetch.spec.whatwg.org/#concept-enqueue-readablestream
https://fetch.spec.whatwg.org/#concept-get-reader
https://fetch.spec.whatwg.org/#concept-read-all-bytes-from-readablestream
https://fetch.spec.whatwg.org/#concept-read-chunk-from-readablestream
https://mimesniff.spec.whatwg.org/#parsable-mime-type

Links to definitions that are not exported:

https://html.spec.whatwg.org/#serializable-objects

Links to specs that should no longer be referenced:

https://www.w3.org/TR/workers/

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

File System Access
Links to anchors that are not definitions or headings:

https://storage.spec.whatwg.org/#site-storage

Links to definitions that are not exported:

https://html.spec.whatwg.org/#file-upload-state-(type=file)
https://html.spec.whatwg.org/#serializable-objects
https://html.spec.whatwg.org/#activation-notification
https://html.spec.whatwg.org/#concept-dnd-rw
https://html.spec.whatwg.org/#concept-dnd-ro
https://html.spec.whatwg.org/#the-drag-data-item-kind
https://w3c.github.io/FileAPI/#UnixEpoch
https://w3c.github.io/FileAPI/#snapshot-state
https://w3c.github.io/FileAPI/#readOperation
https://w3c.github.io/permissions/#create-a-permissionstatus
https://storage.spec.whatwg.org/#storage-endpoint-identifier
https://storage.spec.whatwg.org/#storage-endpoint-types
https://storage.spec.whatwg.org/#storage-endpoint-quota

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Filter Effects Module Level 1
Links to anchors that don't exist:

https://drafts.csswg.org/css-position-3/#stacking-context
https://drafts.csswg.org/css-values-3/#typedef-number-percentage
https://drafts.csswg.org/css-color-3/#valuea-def-color
https://drafts.csswg.org/css-color-3/#color0
https://www.w3.org/TR/css-transitions-1/#animtype-length
https://www.w3.org/TR/css-transitions-1/#animtype-number
https://www.w3.org/TR/css-transitions-1/#animtype-shadow-list

Links to definitions that are not exported:

https://drafts.csswg.org/web-animations-1/#composite-operation-replace

Links to dated TR URLs:

https://www.w3.org/TR/2011/REC-SVG11-20110816/
https://www.w3.org/TR/2008/REC-SVGTiny12-20081222/
https://www.w3.org/TR/2012/WD-filter-effects-20121025/

Frame Timing
Links to specs that should no longer be referenced:

https://www.w3.org/TR/html5/

Fullscreen API Standard
Links to definitions that are not exported:

https://w3c.github.io/screen-orientation/#dfn-triggered-by-a-user-generated-orientation-change

Gamepad
Links to anchors that don't exist:

https://www.w3.org/TR/navigation-timing/#performancetiming

Generic Sensor API
Links to anchors that don't exist:

https://w3c.github.io/webdriver/#dfn-session
https://w3c.github.io/webdriver/#dfn-local-end
https://w3c.github.io/webdriver/#handling-errors

Links to anchors that no longer exist in the editor draft of the target spec:

https://www.w3.org/TR/page-visibility-2/#dfn-steps-to-determine-the-visibility-state

Links to anchors that are not definitions or headings:

https://html.spec.whatwg.org/#origin-2

Links to definitions that are not exported:

https://html.spec.whatwg.org/#currently-focused-area-of-a-top-level-browsing-context
https://html.spec.whatwg.org/#gains-focus
https://html.spec.whatwg.org/#task-queue
https://html.spec.whatwg.org/#spin-the-event-loop
https://w3c.github.io/webdriver/#dfn-extension-command
https://w3c.github.io/webdriver/#dfn-current-browsing-context
https://w3c.github.io/webdriver/#dfn-object
https://w3c.github.io/webdriver/#dfn-extension-command-uri-template
https://w3c.github.io/webdriver/#dfn-remote-end-steps
https://w3c.github.io/webdriver/#dfn-errors
https://w3c.github.io/webdriver/#dfn-error-code
https://w3c.github.io/webdriver/#dfn-invalid-argument
https://w3c.github.io/webdriver/#dfn-no-longer-open
https://w3c.github.io/webdriver/#dfn-no-such-window
https://w3c.github.io/webdriver/#dfn-handle-any-user-prompts
https://w3c.github.io/webdriver/#dfn-success
https://w3c.github.io/webdriver/#dfn-url-variables

Geolocation Sensor
Links to definitions that are not exported:

https://w3c.github.io/sensors/#sensor-type
https://w3c.github.io/sensors/#latest-reading
https://w3c.github.io/sensors/#notify-error
https://w3c.github.io/sensors/#notify-new-reading
https://w3c.github.io/sensors/#get-value-from-latest-reading
https://w3c.github.io/sensors/#mock-sensor-type

Geometry Interfaces Module Level 1
Links to anchors that are not definitions or headings:

https://drafts.csswg.org/css-transforms-1/#TranslateDefined
https://drafts.csswg.org/css-transforms-1/#ScaleDefined
https://drafts.csswg.org/css-transforms-1/#RotateDefined
https://drafts.csswg.org/css-transforms-1/#SkewXDefined
https://drafts.csswg.org/css-transforms-1/#SkewYDefined

Links to definitions that are not exported:

https://html.spec.whatwg.org/#serializable-objects
https://drafts.csswg.org/css-values-4/#absolute-length

Links to things that look like specs but that aren't recognized in reffy data:

https://tc39.github.io/ecma262/

Get Installed Related Apps API
Links to anchors that don't exist:

https://www.w3.org/TR/appmanifest/#obtaining
https://html.spec.whatwg.org/#responsible-browsing-context

Graphics Accessibility API Mappings
Links to anchors that don't exist:

https://w3c.github.io/graphics-aria/#graphics-document
https://w3c.github.io/graphics-aria/#graphics-object
https://w3c.github.io/graphics-aria/#graphics-symbol

Links to specs that should no longer be referenced:

https://www.w3.org/TR/html52/

Gyroscope
Links to definitions that are not exported:

https://w3c.github.io/sensors/#sensor-reading
https://w3c.github.io/sensors/#sensor-type
https://w3c.github.io/sensors/#latest-reading
https://w3c.github.io/sensors/#get-value-from-latest-reading
https://w3c.github.io/sensors/#mock-sensor-type

High Resolution Time
Links to definitions that are not exported:

https://html.spec.whatwg.org/#creating-a-new-browsing-context
https://html.spec.whatwg.org/#prompt-to-unload-a-document

HTML Accessibility API Mappings 1.0
Links to anchors that don't exist:

https://www.w3.org/TR/core-aam-1.1/#ariaRoleDescription
https://www.w3.org/TR/core-aam-1.1/#role-map-link
https://www.w3.org/TR/core-aam-1.1/#role-map-article
https://www.w3.org/TR/core-aam-1.1/#role-map-complementary
https://www.w3.org/TR/core-aam-1.1/#role-map-button
https://www.w3.org/TR/core-aam-1.1/#role-map-slider
https://www.w3.org/TR/core-aam-1.1/#role-map-toolbar
https://www.w3.org/TR/core-aam-1.1/#role-map-listbox
https://www.w3.org/TR/core-aam-1.1/#ariaMultiselectableFalse
https://www.w3.org/TR/core-aam-1.1/#role-map-definition
https://www.w3.org/TR/core-aam-1.1/#role-map-term
https://www.w3.org/TR/core-aam-1.1/#role-map-dialog
https://www.w3.org/TR/core-aam-1.1/#role-map-group
https://www.w3.org/TR/core-aam-1.1/#role-map-figure
https://www.w3.org/TR/core-aam-1.1/#role-map-contentinfo
https://www.w3.org/TR/core-aam-1.1/#role-map-form
https://www.w3.org/TR/core-aam-1.1/#role-map-heading
https://www.w3.org/TR/core-aam-1.1/#ariaLevel
https://www.w3.org/TR/core-aam-1.1/#role-map-banner
https://www.w3.org/TR/core-aam-1.1/#role-map-separator
https://www.w3.org/TR/core-aam-1.1/#role-map-img
https://www.w3.org/TR/core-aam-1.1/#role-map-presentation
https://www.w3.org/TR/core-aam-1.1/#role-map-checkbox
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedMixed
https://www.w3.org/TR/core-aam-1.1/#role-map-textbox
https://www.w3.org/TR/core-aam-1.1/#role-map-spinbutton
https://www.w3.org/TR/core-aam-1.1/#role-map-radio
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedTrue
https://www.w3.org/TR/core-aam-1.1/#ariaSetsize
https://www.w3.org/TR/core-aam-1.1/#ariaPosinset
https://www.w3.org/TR/core-aam-1.1/#role-map-searchbox
https://www.w3.org/TR/core-aam-1.1/#role-map-combobox
https://www.w3.org/TR/core-aam-1.1/#ariaOwns
https://www.w3.org/TR/core-aam-1.1/#role-map-listitem
https://www.w3.org/TR/core-aam-1.1/#role-map-main
https://www.w3.org/TR/core-aam-1.1/#role-map-math
https://www.w3.org/TR/core-aam-1.1/#role-map-list
https://www.w3.org/TR/core-aam-1.1/#role-map-menu
https://www.w3.org/TR/core-aam-1.1/#role-map-navigation
https://www.w3.org/TR/core-aam-1.1/#role-map-option
https://www.w3.org/TR/core-aam-1.1/#ariaSelectedTrue
https://www.w3.org/TR/core-aam-1.1/#role-map-status
https://www.w3.org/TR/core-aam-1.1/#role-map-progressbar
https://www.w3.org/TR/core-aam-1.1/#ariaValueMax
https://www.w3.org/TR/core-aam-1.1/#ariaValueMin
https://www.w3.org/TR/core-aam-1.1/#ariaValueNow
https://www.w3.org/TR/core-aam-1.1/#role-map-region
https://www.w3.org/TR/core-aam-1.1/#role-map-table
https://www.w3.org/TR/core-aam-1.1/#role-map-rowgroup
https://www.w3.org/TR/core-aam-1.1/#role-map-cell
https://www.w3.org/TR/core-aam-1.1/#role-map-grid
https://www.w3.org/TR/core-aam-1.1/#role-map-treegrid
https://www.w3.org/TR/core-aam-1.1/#role-map-gridcell
https://www.w3.org/TR/core-aam-1.1/#ariaMultilineTrue
https://www.w3.org/TR/core-aam-1.1/#role-map-columnheader
https://www.w3.org/TR/core-aam-1.1/#role-map-rowheader
https://www.w3.org/TR/core-aam-1.1/#role-map-row
https://www.w3.org/TR/core-aam-1.1/#ariaAutocompleteInlineListBoth
https://www.w3.org/TR/core-aam-1.1/#ariaFlowto
https://www.w3.org/TR/core-aam-1.1/#ariaCheckedFalse
https://www.w3.org/TR/core-aam-1.1/#ariaColSpan
https://www.w3.org/TR/core-aam-1.1/#ariaDisabledTrue
https://www.w3.org/TR/core-aam-1.1/#ariaHiddenTrue
https://www.w3.org/TR/core-aam-1.1/#ariaControls
https://www.w3.org/TR/core-aam-1.1/#ariaExpandedTrue
https://www.w3.org/TR/core-aam-1.1/#ariaPlaceholder
https://www.w3.org/TR/core-aam-1.1/#ariaReadonlyTrue
https://www.w3.org/TR/core-aam-1.1/#ariaRequiredTrue
https://www.w3.org/TR/core-aam-1.1/#ariaRowSpan
https://www.w3.org/TR/core-aam-1.1/#ariaInvalidSpellingGrammar
https://html.spec.whatwg.org/#attr-iframe-allowpaymentrequest
https://html.spec.whatwg.org/#element-attrdef-track-kind
https://www.w3.org/TR/html/#element-attrdef-input-type
https://www.w3.org/TR/html/#button-state-typebutton
https://www.w3.org/TR/html/#checkbox-state-typecheckbox
https://www.w3.org/TR/html/#forms-checkedness
https://www.w3.org/TR/html/#color-state-typecolor
https://www.w3.org/TR/html/#date-state-typedate
https://www.w3.org/TR/html/#email-state-typeemail
https://www.w3.org/TR/html/#suggestions-source-element
https://www.w3.org/TR/html/#file-upload-state-typefile
https://www.w3.org/TR/html/#hidden-state-typehidden
https://www.w3.org/TR/html/#image-button-state-typeimage
https://www.w3.org/TR/html/#local-date-and-time-state-typedatetimelocal
https://www.w3.org/TR/html/#month-state-typemonth
https://www.w3.org/TR/html/#number-state-typenumber
https://www.w3.org/TR/html/#password-state-typepassword
https://www.w3.org/TR/html/#radio-button-state-typeradio
https://www.w3.org/TR/html/#range-state-typerange
https://www.w3.org/TR/html/#reset-button-state-typereset
https://www.w3.org/TR/html/#text-typetext-state-and-search-state-typesearch
https://www.w3.org/TR/html/#submit-button-state-typesubmit
https://www.w3.org/TR/html/#telephone-state-typetel
https://www.w3.org/TR/html/#url-state-typeurl
https://www.w3.org/TR/html/#element-attrdef-input-list
https://www.w3.org/TR/html/#time-state-typetime
https://www.w3.org/TR/html/#week-state-typeweek
https://www.w3.org/TR/html/#element-attrdef-select-multiple
https://www.w3.org/TR/html/#element-attrdef-select-size
https://www.w3.org/TR/html/#svg
https://www.w3.org/TR/html/#element-attrdef-label-for
https://www.w3.org/TR/html/#element-attrdef-output-for
https://www.w3.org/TR/html/#element-attrdef-formelements-form
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formaction
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formenctype
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formmethod
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formnovalidate
https://www.w3.org/TR/html/#element-attrdef-submitbuttonelements-formtarget
https://www.w3.org/TR/html/#element-attrdef-tablecells-headers
https://www.w3.org/TR/html/#element-attrdef-canvas-height
https://www.w3.org/TR/html/#element-attrdef-media-height
https://www.w3.org/TR/html/#element-attrdef-link-href
https://www.w3.org/TR/html/#element-attrdef-a-hreflang
https://www.w3.org/TR/html/#elementdef-area
https://www.w3.org/TR/html/#element-attrdef-link-hreflang
https://www.w3.org/TR/html/#element-attrdef-meta-http-equiv
https://www.w3.org/TR/html/#element-attrdef-global-id
https://www.w3.org/TR/html/#element-attrdef-input-checked
https://www.w3.org/TR/html/#element-attrdef-img-ismap
https://www.w3.org/TR/html/#element-attrdef-global-lang
https://www.w3.org/TR/html/#element-attrdef-media-loop
https://www.w3.org/TR/html/#element-attrdef-input-maxlength
https://www.w3.org/TR/html/#element-attrdef-textarea-maxlength
https://www.w3.org/TR/html/#element-attrdef-link-media
https://www.w3.org/TR/html/#element-attrdef-source-media
https://www.w3.org/TR/html/#element-attrdef-style-media
https://www.w3.org/TR/html/#element-attrdef-form-method
https://www.w3.org/TR/html/#element-attrdef-input-multiple
https://www.w3.org/TR/html/#element-attrdef-media-muted
https://www.w3.org/TR/html/#element-attrdef-formelements-name
https://www.w3.org/TR/html/#element-attrdef-form-name
https://www.w3.org/TR/html/#element-attrdef-iframe-name
https://www.w3.org/TR/html/#element-attrdef-object-name
https://www.w3.org/TR/html/#element-attrdef-map-name
https://www.w3.org/TR/html/#element-attrdef-meta-name
https://www.w3.org/TR/html/#element-attrdef-param-name
https://www.w3.org/TR/html/#element-attrdef-form-novalidate
https://www.w3.org/TR/html/#element-attrdef-details-open
https://www.w3.org/TR/html/#element-attrdef-input-placeholder
https://www.w3.org/TR/html/#element-attrdef-textarea-placeholder
https://www.w3.org/TR/html/#element-attrdef-input-readonly
https://www.w3.org/TR/html/#element-attrdef-textarea-readonly
https://www.w3.org/TR/html/#element-attrdef-a-rel
https://www.w3.org/TR/html/#element-attrdef-link-rel
https://www.w3.org/TR/html/#element-attrdef-input-required
https://www.w3.org/TR/html/#element-attrdef-select-required
https://www.w3.org/TR/html/#element-attrdef-textarea-required
https://www.w3.org/TR/html/#element-attrdef-tablecells-rowspan
https://www.w3.org/TR/html/#element-attrdef-iframe-sandbox
https://www.w3.org/TR/html/#element-attrdef-option-selected
https://www.w3.org/TR/html/#element-attrdef-area-shape
https://www.w3.org/TR/html/#element-attrdef-col-span