Relink spec URL fragments that webref no longer knows

features/anchor-positioning-transforms.yml

@@ -1,5 +1,5 @@
 name: Anchor positioning transforms
 description: Anchor positioned elements take CSS transforms on their anchor elements into account.
-spec: https://drafts.csswg.org/css-anchor-position-1/#anchoring
+spec: https://drafts.csswg.org/css-anchor-position-1/#anchor-positioning
 compat_features:
   - css.properties.anchor-name.position_after_layout

features/anchor-positioning.yml

@@ -1,6 +1,6 @@
 name: Anchor positioning
 description: Anchor positioning places an element based on the position of another element. For example, you can place a tooltip next to the content it references.
-spec: https://drafts.csswg.org/css-anchor-position-1/#anchoring
+spec: https://drafts.csswg.org/css-anchor-position-1/#anchor-positioning
 caniuse: css-anchor-positioning
 compat_features:
   - api.CSSPositionTryDescriptors

features/array-iterators.yml

@@ -1,7 +1,7 @@
 name: Array iterators
 description: Arrays are iterable with the `for … of` statement and enumerable with the methods `entries()`, `keys()`, and `values()`.
 spec:
-  - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype-@@iterator
+  - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype-%25symbol.iterator%25
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.entries
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.keys
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.values

features/background-attachment.yml

@@ -1,6 +1,6 @@
 name: background-attachment
 description: The `background-attachment` CSS property sets whether an element's background image or gradient moves as the element scrolls.
-spec: https://drafts.csswg.org/css-backgrounds-3/#the-background-attachment
+spec: https://drafts.csswg.org/css-backgrounds-3/#background-attachment
 group: background
 caniuse: background-attachment
 # TODO: https://github.com/web-platform-dx/web-features/issues/1971

features/calc.yml

@@ -1,6 +1,6 @@
 name: calc()
 description: The `calc()` CSS function computes mathematical expressions such a `calc(100%/3 - 1em)`.
-spec: https://drafts.csswg.org/css-values-3/#calc-notation
+spec: https://drafts.csswg.org/css-values-3/#funcdef-calc
 group: css
 caniuse: calc
 status:

features/contain-inline-size.yml

@@ -1,6 +1,6 @@
 name: Inline-size containment
 description: "The `contain: inline-size` CSS declaration prevents the element's inline dimension from being set by the element's contents. This permits the browser to avoid slower layout calculations."
-spec: https://drafts.csswg.org/css-contain-3/#containment-inline-size
+spec: https://drafts.csswg.org/css-contain-2/#containment-inline-size
 group: containment
 compat_features:
   - css.properties.contain.inline-size

features/custom-ellipses.yml

@@ -1,5 +1,5 @@
 name: Custom ellipses
 description: The `text-overflow` CSS property with a string value sets the string representing clipped text.
-spec: https://drafts.csswg.org/css-overflow-4/#overflow-string
+spec: https://drafts.csswg.org/css-overflow-4/#text-overflow
 compat_features:
   - css.properties.text-overflow.string

features/display-animation.yml

@@ -2,5 +2,5 @@ name: display animation
 description: "You can animate elements between `display: none` and any other `display` value or animate between `content-visibility: hidden` and any other `content-visibility` value. This also applies to transitions."
 spec:
   - https://drafts.csswg.org/css-display-4/#display-animation
-  - https://drafts.csswg.org/css-contain-3/#content-visibility-animation
+  - https://drafts.csswg.org/css-contain-2/#content-visibility-animation
 group: css

features/font-family-math.yml

@@ -1,6 +1,6 @@
 name: Math font family
 description: "The `font-family: math` CSS declaration uses the browser default font face for displaying mathematical expressions."
-spec: https://drafts.csswg.org/css-fonts-4/#math-def
+spec: https://drafts.csswg.org/css-fonts-4/#valdef-font-family-math
 # TODO: https://github.com/web-platform-dx/web-features/issues/1971
 # Status changed: https://github.com/web-platform-dx/web-features/pull/3867
 # 2026-03-16 — low → false — Upstream data incorrectly reported that `font-family: math` shipped in Firefox 145. It actually shipped in Firefox 149.

features/font-family-system.yml

@@ -1,6 +1,6 @@
 name: System font
 description: "The `font-family: system-ui` CSS declaration uses the operating system default font for text."
-spec: https://drafts.csswg.org/css-fonts-4/#system-ui-def
+spec: https://drafts.csswg.org/css-fonts-4/#valdef-font-family-system-ui
 caniuse: font-family-system-ui
 compat_features:
   - css.properties.font-family.system-ui

features/font-family-ui.yml

@@ -1,6 +1,6 @@
 name: UI fonts
 description: The `ui-serif`, `ui-sans-serif`, `ui-monospace` and `ui-rounded` values for the `font-family` CSS property use device-default user interface fonts for text.
-spec: https://drafts.csswg.org/css-fonts-4/#ui-serif-def
+spec: https://drafts.csswg.org/css-fonts-4/#valdef-font-family-ui-serif
 caniuse: extended-system-fonts
 group: fonts
 compat_features:

features/gif.yml

@@ -1,6 +1,6 @@
 name: GIF
 description: The GIF (Graphics Interchange Format) image format is a raster graphics file format with animation and lossless compression.
 spec:
-  - https://www.w3.org/Graphics/GIF/spec-gif89a.txt#top
+  - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
 compat_features:
   - mediatypes.image.gif

features/hyphens.yml

@@ -2,7 +2,7 @@ name: Hyphenation
 # The description should be revisited when support notes are added.
 # https://github.com/web-platform-dx/web-features/issues/915
 description: The `hyphens` CSS property controls when long words are broken by line wrapping. Although called `hyphens`, the property applies to word-splitting behavior across languages, such as customary spelling changes or the use of other characters. Support for non-English languages varies significantly.
-spec: https://drafts.csswg.org/css-text-3/#hyphens-property
+spec: https://drafts.csswg.org/css-text-3/#propdef-hyphens
 caniuse: css-hyphens
 group: css
 compat_features:

features/indeterminate.yml

@@ -1,7 +1,7 @@
 name: ":indeterminate"
 description: The `:indeterminate` CSS pseudo-class selects any form element whose state is indeterminate, such as checkboxes that have been set to an indeterminate state with JavaScript, or radio buttons which are members of a group in which all radio buttons are unchecked.
 spec:
-  - https://drafts.csswg.org/selectors-4/#indeterminate
+  - https://drafts.csswg.org/selectors-4/#indeterminate-pseudo
   - https://html.spec.whatwg.org/multipage/semantics-other.html#selector-indeterminate
 group: forms
 caniuse: css-indeterminate-pseudo

features/intl.yml

@@ -1,7 +1,7 @@
 name: Intl
 description: "The `Intl` API provides language sensitive string comparison, number formatting, date and time formatting, and more."
 group: intl
-spec: https://tc39.es/ecma402/#introduction
+spec: https://tc39.es/ecma402/
 caniuse: internationalization
 status:
   compute_from: javascript.builtins.Intl

features/iterators.yml

@@ -3,7 +3,7 @@ description: The `for...of` loop operates on a sequence of values sourced from a
 group: iterators
 snapshot: ecmascript-2015
 spec:
-  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-%iteratorprototype%-object
+  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-%25iterator.prototype%25-object
   - https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements
 status:
   compute_from: javascript.statements.for_of

features/javascript.yml

@@ -1,6 +1,6 @@
 name: JavaScript (initial core language support)
 description: JavaScript is a programming language that runs in browsers, usually through the `<script>` element. JavaScript has changed over many years. This feature represents the oldest language features, such as built-in objects, statements, and operators. Also known as ECMAScript.
-spec: https://tc39.es/ecma262/multipage/#sec-intro
+spec: https://tc39.es/ecma262/multipage/
 group: javascript
 compat_features:
   - javascript.builtins.Boolean

features/manifest-localization.yml

@@ -1,6 +1,6 @@
 name: Web app manifest localization
 description: The `_localized` suffixed members of the web app manifest set translated names, descriptions, icons, and shortcuts. The browser automatically selects resources based on the user's language and region settings.
-spec: https://w3c.github.io/manifest/#localized-members
+spec: https://w3c.github.io/manifest/#x_localized-members
 group: progressive-web-app
 # Expected compat keys:
 # - manifests.webapp.name_localized

features/map.yml

@@ -13,8 +13,8 @@ spec:
   - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.set
   - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-get-map.prototype.size
   - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.values
-  - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype-@@iterator
-  - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-get-map-@@species
+  - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype-%25symbol.iterator%25
+  - https://tc39.es/ecma262/multipage/keyed-collections.html#sec-get-map-%25symbol.species%25
 snapshot: ecmascript-2015
 group: maps
 status:

features/parse-html-unsafe.yml

@@ -1,6 +1,6 @@
 name: Unsanitized HTML parsing methods
 description: The `Document.parseHTMLUnsafe()` static method parses HTML into a DOM tree, while the `setHTMLUnsafe()` method of `Element` and `ShadowRoot` parses and inserts HTML into an existing tree. No sanitization applies to these methods, so never call them with user-provided HTML strings.
-spec: https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#unsafe-html-parsing-methods
+spec: https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#html-parsing-methods
 # TODO: https://github.com/web-platform-dx/web-features/issues/1971
 # Status changed: https://github.com/web-platform-dx/web-features/pull/3200
 # 2025-08-06 - low → false - In Safari, if there are custom elements in a declarative shadow root in the parsed HTML, then the elements' constructors and `connectedCallback()` methods are not called.

features/performancetiming.yml

@@ -1,11 +1,11 @@
 name: PerformanceTiming and PerformanceNavigation
 description: The `window.performance.timing` and `window.performance.navigation` APIs report performance timing information for events that occur during the loading and use of the current page.
-spec: https://w3c.github.io/navigation-timing/#obsolete
+spec: https://w3c.github.io/navigation-timing/#obsolete-heading
 group: performance
 discouraged:
   reason: This feature is supserseded by the `PerformanceNavigationTiming` API.
   according_to:
-    - https://w3c.github.io/navigation-timing/#obsolete
+    - https://w3c.github.io/navigation-timing/#obsolete-heading
   alternatives:
     - performance
     - navigation-timing

features/promise.yml

@@ -4,7 +4,7 @@ caniuse: promises
 snapshot: ecmascript-2015
 spec:
   - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-promise-objects
-  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-get-promise-@@species
+  - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-get-promise-%25symbol.species%25
   - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-promise-constructor
   - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-promise.all
   - https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-promise.prototype.catch

features/scope.yml

@@ -1,6 +1,6 @@
 name: "@scope"
 description: The `@scope` CSS at-rule sets the scope for a group of rules.
-spec: https://drafts.csswg.org/css-cascade-6/#scope-atrule
+spec: https://drafts.csswg.org/css-cascade-6/#at-ruledef-scope
 group: css
 caniuse: css-cascade-scope
 compat_features:

features/text-fit.yml

@@ -2,7 +2,7 @@ name: text-fit
 description: >
   The `text-fit` CSS property scales text to fill the inline size of its container.
   You can use this to grow or shrink headlines, captions, or pull quotes to fit a container.
-spec: https://drafts.csswg.org/css-text-4/#propdef-text-fit
+spec: https://drafts.csswg.org/css-text-5/#propdef-text-fit
 compat_features:
   - css.properties.text-fit
   - css.properties.text-fit.none

features/typed-array-iterators.yml

@@ -1,7 +1,7 @@
 name: Typed array iterators
 description: Typed arrays are iterable with the `for … of` statement and enumerable with the methods `entries()`, `keys()`, and `values()`.
 spec:
-  - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%25typedarray%25.prototype-@@iterator
+  - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%25typedarray%25.prototype-%25symbol.iterator%25
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%25typedarray%25.prototype.entries
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%25typedarray%25.prototype.keys
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%25typedarray%25.prototype.values

features/typed-arrays.yml

@@ -1,7 +1,6 @@
 name: Typed arrays (initial support)
 description: "Typed arrays are ordered lists of JavaScript values, where all values are of the same numerical type, such as 8-bit integers or 32-bit floating point numbers."
 spec:
-  - https://tc39.es/ecma262/multipage/indexed-collections.html#table-49
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-constructors
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-objects
   - https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray.bytes_per_element

features/wasm-bigint.yml

@@ -1,6 +1,6 @@
 name: BigInt to i64 conversion (WebAssembly)
 description: Integer values pass bidirectionally between JavaScript and WebAssembly, converted to i64 values in WebAssembly or BigInt values in JavaScript.
-spec: https://webassembly.github.io/spec/js-api/#ref-for-syntax-numtype①⓪
+spec: https://webassembly.github.io/spec/js-api/#dom-valuetype-i64
 group: webassembly
 caniuse: wasm-bigint
 compat_features: