web-platform-dx · ddbeck · May 28, 2026
diff --git a/features/a.yml b/features/a.yml
@@ -2,36 +2,37 @@ name: <a>
 description: The `<a>` element creates a hyperlink to any resource that's accessible via a URL, such as web pages, files, email addresses, or locations within the same page.
 spec: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-a-element
 group: html-elements
-status:
-  compute_from: html.elements.a
 compat_features:
-  - api.HTMLAnchorElement
-  - api.HTMLAnchorElement.hash
-  - api.HTMLAnchorElement.host
-  - api.HTMLAnchorElement.hostname
-  - api.HTMLAnchorElement.href
-  - api.HTMLAnchorElement.hreflang
-  - api.HTMLAnchorElement.origin
-  - api.HTMLAnchorElement.password
-  - api.HTMLAnchorElement.pathname
-  - api.HTMLAnchorElement.port
-  - api.HTMLAnchorElement.protocol
-  - api.HTMLAnchorElement.rel
-  - api.HTMLAnchorElement.relList
-  - api.HTMLAnchorElement.search
-  - api.HTMLAnchorElement.target
-  - api.HTMLAnchorElement.text
-  - api.HTMLAnchorElement.toString
-  - api.HTMLAnchorElement.type
-  - api.HTMLAnchorElement.username
-  - html.elements.a
-  - html.elements.a.href
-  - html.elements.a.href.href_sms
-  - html.elements.a.href.href_top
-  - html.elements.a.hreflang
-  - html.elements.a.implicit_noopener
-  - html.elements.a.rel
-  - html.elements.a.rel.noopener
-  - html.elements.a.rel.noreferrer
-  - html.elements.a.target
-  - html.elements.a.type
+  core:
+    - api.HTMLAnchorElement
+    - api.HTMLAnchorElement.hash
+    - api.HTMLAnchorElement.host
+    - api.HTMLAnchorElement.hostname
+    - api.HTMLAnchorElement.href
+    - api.HTMLAnchorElement.hreflang
+    - api.HTMLAnchorElement.pathname
+    - api.HTMLAnchorElement.port
+    - api.HTMLAnchorElement.protocol
+    - api.HTMLAnchorElement.rel
+    - api.HTMLAnchorElement.search
+    - api.HTMLAnchorElement.target
+    - api.HTMLAnchorElement.text
+    - api.HTMLAnchorElement.type
+    - html.elements.a # former compute_from
+    - html.elements.a.href
+    - html.elements.a.hreflang
+    - html.elements.a.rel
+    - html.elements.a.target
+    - html.elements.a.type
+  modifier:
+    - api.HTMLAnchorElement.origin
+    - api.HTMLAnchorElement.password
+    - api.HTMLAnchorElement.relList
+    - api.HTMLAnchorElement.toString
+    - api.HTMLAnchorElement.username
+    - html.elements.a.href.href_top
+    - html.elements.a.implicit_noopener
+    - html.elements.a.rel.noopener
+    - html.elements.a.rel.noreferrer
+  spare:
+    - html.elements.a.href.href_sms
diff --git a/features/aborting.yml b/features/aborting.yml
@@ -2,18 +2,18 @@ name: AbortController and AbortSignal
 description: The `AbortController` and `AbortSignal` APIs allow you to cancel an ongoing operation, such as a `fetch()` request.
 spec: https://dom.spec.whatwg.org/#aborting-ongoing-activities
 caniuse: abortcontroller
-status:
-  compute_from: api.AbortController
 compat_features:
-  - api.AbortController
-  - api.AbortController.AbortController
-  - api.AbortController.abort
-  - api.AbortController.abort.reason_parameter
-  - api.AbortController.signal
-  - api.AbortSignal
-  - api.AbortSignal.abort_event
-  - api.AbortSignal.abort_static
-  - api.AbortSignal.abort_static.reason_parameter
-  - api.AbortSignal.aborted
-  - api.AbortSignal.reason
-  - api.AbortSignal.throwIfAborted
+  core:
+    - api.AbortController # former compute_from
+    - api.AbortController.AbortController
+    - api.AbortController.abort
+    - api.AbortController.signal
+    - api.AbortSignal
+    - api.AbortSignal.abort_event
+    - api.AbortSignal.aborted
+  modifier:
+    - api.AbortController.abort.reason_parameter
+    - api.AbortSignal.abort_static
+    - api.AbortSignal.abort_static.reason_parameter
+    - api.AbortSignal.reason
+    - api.AbortSignal.throwIfAborted
diff --git a/features/accesskey.yml b/features/accesskey.yml
@@ -1,9 +1,9 @@
 name: accesskey
 description: The `accesskey` global HTML attribute gives a hint for generating a keyboard shortcut for the current element. The attribute value must consist of a single printable character.
 spec: https://html.spec.whatwg.org/multipage/interaction.html#the-accesskey-attribute
-status:
-  compute_from: api.HTMLElement.accessKey
 compat_features:
-  - api.HTMLElement.accessKey
-  - api.HTMLElement.accessKeyLabel
-  - html.global_attributes.accesskey
+  core:
+    - api.HTMLElement.accessKey # former compute_from
+    - html.global_attributes.accesskey
+  spare:
+    - api.HTMLElement.accessKeyLabel
diff --git a/features/animations-css.yml b/features/animations-css.yml
@@ -5,74 +5,75 @@ caniuse: css-animation
 group:
   - animation
   - css
-status:
-  compute_from: css.properties.animation
 compat_features:
-  - api.AnimationEvent
-  - api.AnimationEvent.AnimationEvent
-  - api.AnimationEvent.animationName
-  - api.AnimationEvent.elapsedTime
-  - api.AnimationEvent.pseudoElement
-  - api.CSSAnimation
-  - api.CSSAnimation.animationName
-  - api.CSSKeyframeRule
-  - api.CSSKeyframeRule.keyText
-  - api.CSSKeyframeRule.style
-  - api.CSSKeyframesRule
-  - api.CSSKeyframesRule.appendRule
-  - api.CSSKeyframesRule.cssRules
-  - api.CSSKeyframesRule.deleteRule
-  - api.CSSKeyframesRule.findRule
-  - api.CSSKeyframesRule.length
-  - api.CSSKeyframesRule.name
-  - css.at-rules.keyframes
-  - css.at-rules.keyframes.named_range_keyframes
-  - css.at-rules.keyframes.ignore_important_declarations
-  - css.properties.animation
-  - css.properties.animation.alternate
-  - css.properties.animation.alternate-reverse
-  - css.properties.animation.auto
-  - css.properties.animation.backwards
-  - css.properties.animation.both
-  - css.properties.animation.ease
-  - css.properties.animation.ease-in
-  - css.properties.animation.ease-in-out
-  - css.properties.animation.ease-out
-  - css.properties.animation.forwards
-  - css.properties.animation.infinite
-  - css.properties.animation.linear
-  - css.properties.animation.none
-  - css.properties.animation.normal
-  - css.properties.animation.reverse
-  - css.properties.animation.step-end
-  - css.properties.animation.step-start
-  - css.properties.animation-delay
-  - css.properties.animation-direction
-  - css.properties.animation-direction.alternate
-  - css.properties.animation-direction.alternate-reverse
-  - css.properties.animation-direction.normal
-  - css.properties.animation-direction.reverse
-  - css.properties.animation-duration
-  - css.properties.animation-duration.auto
-  - css.properties.animation-fill-mode
-  - css.properties.animation-fill-mode.backwards
-  - css.properties.animation-fill-mode.both
-  - css.properties.animation-fill-mode.forwards
-  - css.properties.animation-fill-mode.none
-  - css.properties.animation-iteration-count
-  - css.properties.animation-iteration-count.infinite
-  - css.properties.animation-name
-  - css.properties.animation-name.none
-  - css.properties.animation-play-state
-  - css.properties.animation-play-state.paused
-  - css.properties.animation-play-state.running
-  - css.properties.animation-timing-function
-  - css.properties.animation-timing-function.ease
-  - css.properties.animation-timing-function.ease-in
-  - css.properties.animation-timing-function.ease-in-out
-  - css.properties.animation-timing-function.ease-out
-  - css.properties.animation-timing-function.jump
-  - css.properties.animation-timing-function.linear
-  - css.properties.animation-timing-function.step-end
-  - css.properties.animation-timing-function.step-start
-  - css.types.time
+  core:
+    - api.AnimationEvent
+    - api.AnimationEvent.animationName
+    - api.AnimationEvent.elapsedTime
+    - css.at-rules.keyframes
+    - css.properties.animation # former compute_from
+    - css.properties.animation-delay
+    - css.properties.animation-direction
+    - css.properties.animation-direction.alternate
+    - css.properties.animation-direction.alternate-reverse
+    - css.properties.animation-direction.normal
+    - css.properties.animation-direction.reverse
+    - css.properties.animation-duration
+    - css.properties.animation-fill-mode
+    - css.properties.animation-fill-mode.backwards
+    - css.properties.animation-fill-mode.both
+    - css.properties.animation-fill-mode.forwards
+    - css.properties.animation-fill-mode.none
+    - css.properties.animation-iteration-count
+    - css.properties.animation-iteration-count.infinite
+    - css.properties.animation-name
+    - css.properties.animation-name.none
+    - css.properties.animation-play-state
+    - css.properties.animation-play-state.paused
+    - css.properties.animation-play-state.running
+    - css.properties.animation-timing-function
+    - css.properties.animation-timing-function.ease
+    - css.properties.animation-timing-function.ease-in
+    - css.properties.animation-timing-function.ease-in-out
+    - css.properties.animation-timing-function.ease-out
+    - css.properties.animation-timing-function.linear
+    - css.properties.animation-timing-function.step-end
+    - css.properties.animation-timing-function.step-start
+    - css.properties.animation.alternate
+    - css.properties.animation.alternate-reverse
+    - css.properties.animation.auto
+    - css.properties.animation.backwards
+    - css.properties.animation.both
+    - css.properties.animation.ease
+    - css.properties.animation.ease-in
+    - css.properties.animation.ease-in-out
+    - css.properties.animation.ease-out
+    - css.properties.animation.forwards
+    - css.properties.animation.infinite
+    - css.properties.animation.linear
+    - css.properties.animation.none
+    - css.properties.animation.normal
+    - css.properties.animation.reverse
+    - css.properties.animation.step-end
+    - css.properties.animation.step-start
+    - css.types.time
+  modifier:
+    - api.AnimationEvent.AnimationEvent
+    - api.AnimationEvent.pseudoElement
+    - api.CSSAnimation
+    - api.CSSAnimation.animationName
+    - api.CSSKeyframeRule
+    - api.CSSKeyframeRule.keyText
+    - api.CSSKeyframeRule.style
+    - api.CSSKeyframesRule
+    - api.CSSKeyframesRule.appendRule
+    - api.CSSKeyframesRule.cssRules
+    - api.CSSKeyframesRule.deleteRule
+    - api.CSSKeyframesRule.findRule
+    - api.CSSKeyframesRule.name
+    - css.at-rules.keyframes.ignore_important_declarations
+    - css.properties.animation-timing-function.jump
+  spare:
+    - api.CSSKeyframesRule.length
+    - css.at-rules.keyframes.named_range_keyframes
+    - css.properties.animation-duration.auto