evidence.yml

schema_version: 1
sources:
  - id: ref-baseline
    title: MDN Baseline compatibility
    url: https://developer.mozilla.org/en-US/docs/Glossary/Baseline/Compatibility
  - id: ref-supports
    title: MDN @supports
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@supports
  - id: ref-custom-properties
    title: MDN CSS custom properties
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_cascading_variables/Using_CSS_custom_properties
  - id: ref-layer
    title: MDN @layer
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@layer
  - id: ref-import
    title: MDN @import
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@import
  - id: ref-scope
    title: MDN @scope
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@scope
  - id: ref-nesting
    title: MDN CSS nesting
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_nesting/Using_CSS_nesting
  - id: ref-css-modules
    title: CSS Modules project
    url: https://github.com/css-modules/css-modules
  - id: ref-tailwind-theme
    title: Tailwind CSS theme variables
    url: https://tailwindcss.com/docs/theme
  - id: ref-tailwind-directives
    title: Tailwind CSS functions and directives
    url: https://tailwindcss.com/docs/functions-and-directives
  - id: ref-box-sizing
    title: MDN box-sizing
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing
  - id: ref-all
    title: MDN all
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/all
  - id: ref-mask
    title: MDN mask
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/mask
  - id: ref-grid
    title: MDN CSS Grid Layout
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_grid_layout
  - id: ref-flex-align
    title: MDN flex alignment
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_flexible_box_layout/Aligning_items_in_a_flex_container
  - id: ref-repeat
    title: MDN repeat()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/repeat
  - id: ref-minmax
    title: MDN minmax()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/minmax
  - id: ref-subgrid
    title: MDN subgrid
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_grid_layout/Subgrid
  - id: ref-aspect-ratio
    title: MDN aspect-ratio
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/aspect-ratio
  - id: ref-object-fit
    title: MDN object-fit
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit
  - id: ref-logical
    title: MDN logical properties
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_logical_properties_and_values
  - id: ref-dir
    title: MDN :dir()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:dir
  - id: ref-viewport-units
    title: MDN viewport length units
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/length#relative_length_units_based_on_viewport
  - id: ref-container-queries
    title: MDN container queries
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_containment/Container_queries
  - id: ref-container-at
    title: MDN @container
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@container
  - id: ref-container-query-units
    title: MDN container query length units
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_containment/Container_queries#container_query_length_units
  - id: ref-scrollbar-gutter
    title: MDN scrollbar-gutter
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-gutter
  - id: ref-overscroll-behavior
    title: MDN overscroll-behavior
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/overscroll-behavior
  - id: ref-scroll-margin-top
    title: MDN scroll-margin-top
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-margin-top
  - id: ref-table-layout
    title: MDN table-layout
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/table-layout
  - id: ref-line-height
    title: MDN line-height
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
  - id: ref-clamp
    title: MDN clamp()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/clamp
  - id: ref-text-wrap
    title: MDN text-wrap
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/text-wrap
  - id: ref-text-box
    title: MDN text-box
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/text-box
  - id: ref-font-src
    title: MDN @font-face src
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/src
  - id: ref-font-display
    title: MDN font-display
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display
  - id: ref-size-adjust
    title: MDN size-adjust
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/size-adjust
  - id: ref-ascent-override
    title: MDN ascent-override
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/ascent-override
  - id: ref-webdev-fonts
    title: web.dev font best practices
    url: https://web.dev/articles/font-best-practices
  - id: ref-oklch
    title: MDN oklch()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/oklch
  - id: ref-color-mix
    title: MDN color-mix()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/color-mix
  - id: ref-light-dark
    title: MDN light-dark()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark
  - id: ref-relative-colors
    title: MDN relative colors
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_colors/Relative_colors
  - id: ref-contrast-color
    title: MDN contrast-color()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/contrast-color
  - id: ref-accent-color
    title: MDN accent-color
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/accent-color
  - id: ref-focus-visible
    title: MDN :focus-visible
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
  - id: ref-has
    title: MDN :has()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:has
  - id: ref-is
    title: MDN :is()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:is
  - id: ref-where
    title: MDN :where()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:where
  - id: ref-not
    title: MDN :not()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:not
  - id: ref-nth-child
    title: MDN :nth-child()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child
  - id: ref-empty
    title: MDN :empty
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:empty
  - id: ref-content
    title: MDN content
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/content
  - id: ref-pointer-events
    title: MDN pointer-events
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events
  - id: ref-user-valid
    title: MDN :user-valid
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:user-valid
  - id: ref-user-invalid
    title: MDN :user-invalid
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:user-invalid
  - id: ref-open
    title: MDN :open
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:open
  - id: ref-popover-open
    title: MDN :popover-open
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:popover-open
  - id: ref-defined
    title: MDN :defined
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:defined
  - id: ref-state
    title: MDN :state()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:state
  - id: ref-scripting
    title: MDN scripting media feature
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/scripting
  - id: ref-backdrop
    title: MDN ::backdrop
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/::backdrop
  - id: ref-appearance
    title: MDN appearance
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/appearance
  - id: ref-picker
    title: MDN ::picker
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/::picker
  - id: ref-property
    title: MDN @property
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@property
  - id: ref-starting-style
    title: MDN @starting-style
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@starting-style
  - id: ref-transition-behavior
    title: MDN transition-behavior
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/transition-behavior
  - id: ref-interpolate-size
    title: MDN interpolate-size
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/interpolate-size
  - id: ref-calc-size
    title: MDN calc-size()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/calc-size
  - id: ref-scroll-driven
    title: MDN scroll-driven animations
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_scroll-driven_animations
  - id: ref-animation-timeline
    title: MDN animation-timeline
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/animation-timeline
  - id: ref-webkit-sda
    title: WebKit guide to scroll-driven animations
    url: https://webkit.org/blog/17101/a-guide-to-scroll-driven-animations-with-just-css
  - id: ref-view-transition-name
    title: MDN view-transition-name
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/view-transition-name
  - id: ref-view-transition-class
    title: MDN view-transition-class
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/view-transition-class
  - id: ref-view-transition-at
    title: MDN @view-transition
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@view-transition
  - id: ref-reduced-motion
    title: MDN prefers-reduced-motion
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion
  - id: ref-prefers-contrast
    title: MDN prefers-contrast
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-contrast
  - id: ref-forced-colors
    title: MDN forced-colors
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/forced-colors
  - id: ref-forced-color-adjust
    title: MDN forced-color-adjust
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/forced-color-adjust
  - id: ref-system-colors
    title: MDN system colors
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/system-color
  - id: ref-reduced-transparency
    title: MDN prefers-reduced-transparency
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-transparency
  - id: ref-content-visibility
    title: MDN content-visibility
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/content-visibility
  - id: ref-contain-intrinsic-size
    title: MDN contain-intrinsic-size
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/contain-intrinsic-size
  - id: ref-webdev-css-performance
    title: web.dev optimize CSS
    url: https://web.dev/articles/optimize-css
  - id: ref-wcag-focus
    title: WCAG 2.2 focus visible understanding
    url: https://www.w3.org/WAI/WCAG22/Understanding/focus-visible.html
  - id: ref-wcag-contrast
    title: WCAG 2.2 contrast minimum understanding
    url: https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html
  - id: ref-wcag-reflow
    title: WCAG 2.2 reflow understanding
    url: https://www.w3.org/WAI/WCAG22/Understanding/reflow.html
  - id: ref-postcss
    title: PostCSS documentation
    url: https://postcss.org/
  - id: ref-autoprefixer
    title: Autoprefixer
    url: https://github.com/postcss/autoprefixer
  - id: ref-browserslist
    title: Browserslist
    url: https://browsersl.ist/
  - id: ref-stylelint
    title: Stylelint documentation
    url: https://stylelint.io/
  - id: ref-sass
    title: Sass documentation
    url: https://sass-lang.com/documentation/
  - id: ref-less
    title: Less documentation
    url: https://lesscss.org/
  - id: ref-field-sizing
    title: MDN field-sizing
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/field-sizing
  - id: ref-anchor-module
    title: MDN CSS anchor positioning
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_anchor_positioning
  - id: ref-attr
    title: MDN attr()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/attr
  - id: ref-shape
    title: MDN shape()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/basic-shape/shape
  - id: ref-corner-shape
    title: MDN corner-shape
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/corner-shape
  - id: ref-playing
    title: MDN :playing
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/:playing
  - id: ref-highlight
    title: MDN ::highlight()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/::highlight
  - id: ref-scroll-state-queries
    title: MDN scroll-state container queries
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_conditional_rules/Container_scroll-state_queries
  - id: ref-line-clamp
    title: MDN line-clamp
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/line-clamp
  - id: ref-round
    title: MDN round()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/round
  - id: ref-if
    title: MDN if()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/if
  - id: ref-function
    title: MDN @function
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/@function
  - id: ref-sibling-index
    title: MDN sibling-index()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/sibling-index
  - id: ref-sibling-count
    title: MDN sibling-count()
    url: https://developer.mozilla.org/en-US/docs/Web/CSS/sibling-count
  - id: ref-webdev-0526
    title: web.dev platform updates May 2026
    url: https://web.dev/blog/web-platform-05-2026
claims:
  - id: custom-properties
    capability_id: design-tokens
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-custom-properties, ref-baseline]
    fallback: Literal default declarations are available, but semantic custom properties are the preferred interface.
  - id: cascade-layers
    capability_id: cascade-layers
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-layer, ref-baseline]
    fallback: Intentional source order.
  - id: native-nesting
    capability_id: cascade-layers
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-nesting, ref-baseline]
    fallback: Flat selectors or a preprocessor in an existing project.
  - id: scope
    capability_id: component-scope
    status: newly
    reviewed_at: August 2026
    next_review_at: September 2028
    source_ids: [ref-scope, ref-baseline]
    fallback: CSS Modules or a documented component root class.
  - id: grid
    capability_id: grid-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-grid, ref-baseline]
    fallback: Block flow or Flexbox.
  - id: subgrid
    capability_id: grid-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-subgrid, ref-baseline]
    fallback: Explicit local tracks.
  - id: flexbox
    capability_id: flex-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-flex-align, ref-baseline]
    fallback: Block flow.
  - id: aspect-ratio
    capability_id: intrinsic-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-aspect-ratio, ref-baseline]
    fallback: Explicit dimensions only where content remains usable.
  - id: logical-properties
    capability_id: intrinsic-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-logical, ref-baseline]
    fallback: Physical properties for a constrained legacy direction policy.
  - id: dynamic-viewport-units
    capability_id: intrinsic-layout
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-viewport-units, ref-baseline]
    fallback: min-block-size with normal document flow.
  - id: container-queries
    capability_id: container-queries
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-container-queries, ref-baseline]
    fallback: Intrinsic wrapping or a viewport query for page-level behavior.
  - id: container-units
    capability_id: container-units
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-container-query-units, ref-baseline]
    fallback: rem and clamp values.
  - id: container-style-queries
    capability_id: style-queries
    status: newly
    reviewed_at: August 2026
    next_review_at: November 2028
    source_ids: [ref-container-at, ref-webdev-0526]
    fallback: Explicit data or variant class.
  - id: name-only-container-queries
    capability_id: style-queries
    status: newly
    reviewed_at: August 2026
    next_review_at: November 2028
    source_ids: [ref-container-at, ref-webdev-0526]
    fallback: Explicit data or variant class.
  - id: clamp
    capability_id: fluid-type
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-clamp, ref-baseline]
    fallback: The min value.
  - id: text-wrap
    capability_id: text-wrapping
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-text-wrap, ref-baseline]
    fallback: Normal wrapping.
  - id: text-box
    capability_id: text-box
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-text-box, ref-baseline]
    fallback: Normal line box metrics.
  - id: size-adjust
    capability_id: font-metrics
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-size-adjust, ref-baseline]
    fallback: Normal fallback font metrics.
  - id: ascent-override
    capability_id: font-metrics
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-ascent-override, ref-baseline]
    fallback: size-adjust or an ordinary fallback stack.
  - id: oklch
    capability_id: modern-colors
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-oklch, ref-baseline]
    fallback: Precomputed sRGB semantic colors.
  - id: color-mix
    capability_id: modern-colors
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-color-mix, ref-baseline]
    fallback: Precomputed derived color token.
  - id: light-dark
    capability_id: semantic-colors
    status: newly
    reviewed_at: August 2026
    next_review_at: November 2026
    source_ids: [ref-light-dark, ref-baseline]
    fallback: prefers-color-scheme token overrides.
  - id: relative-colors
    capability_id: modern-colors
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-relative-colors, ref-baseline]
    fallback: Precomputed semantic color token.
  - id: contrast-color
    capability_id: modern-colors
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-contrast-color, ref-baseline]
    fallback: A verified authored foreground token.
  - id: accent-color
    capability_id: customizable-select
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-accent-color, ref-baseline]
    fallback: Native control colors.
  - id: focus-visible
    capability_id: focus-visible
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-focus-visible, ref-baseline]
    fallback: :focus indicator.
  - id: has
    capability_id: relational-state
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-has, ref-baseline]
    fallback: Owner-managed class or data state.
  - id: user-valid
    capability_id: form-state
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-user-valid, ref-user-invalid, ref-baseline]
    fallback: Native validity UI and explicit messages.
  - id: open
    capability_id: native-disclosures
    status: newly
    reviewed_at: August 2026
    next_review_at: November 2028
    source_ids: [ref-open, ref-webdev-0526]
    fallback: Attribute selector or owner state class.
  - id: popover
    capability_id: popover
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-popover-open, ref-baseline]
    fallback: Inline content or an accessible dialog.
  - id: customizable-select
    capability_id: customizable-select
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-appearance, ref-picker, ref-baseline]
    fallback: Native select.
  - id: property
    capability_id: ordinary-transitions
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-property, ref-baseline]
    fallback: Untyped custom property or ordinary property transition.
  - id: starting-style
    capability_id: ordinary-transitions
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-starting-style, ref-baseline]
    fallback: Enter without a transition.
  - id: transition-behavior
    capability_id: ordinary-transitions
    status: newly
    reviewed_at: August 2026
    next_review_at: February 2027
    source_ids: [ref-transition-behavior, ref-baseline]
    fallback: Immediate discrete state change.
  - id: interpolate-size
    capability_id: disclosure-motion
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-interpolate-size, ref-calc-size, ref-baseline]
    fallback: Grid-row or immediate disclosure.
  - id: scroll-driven-animations
    capability_id: scroll-driven-animation
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-scroll-driven, ref-animation-timeline, ref-webkit-sda]
    fallback: Static content or ordinary transition.
  - id: same-document-view-transitions
    capability_id: view-transitions
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-view-transition-name, ref-view-transition-class, ref-baseline]
    fallback: Normal state change.
  - id: reduced-motion
    capability_id: preference-media
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-reduced-motion, ref-baseline]
    fallback: Low-motion default.
  - id: forced-colors
    capability_id: forced-colors
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-forced-colors, ref-system-colors, ref-baseline]
    fallback: Permit user-agent color mapping.
  - id: prefers-contrast
    capability_id: preference-media
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-prefers-contrast, ref-baseline]
    fallback: WCAG-conformant normal theme.
  - id: reduced-transparency
    capability_id: preference-media
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-reduced-transparency, ref-baseline]
    fallback: A solid-surface default.
  - id: content-visibility
    capability_id: content-visibility
    status: widely
    reviewed_at: August 2026
    source_ids: [ref-content-visibility, ref-contain-intrinsic-size, ref-baseline]
    fallback: Normal rendering.
  - id: field-sizing
    capability_id: intrinsic-layout
    status: newly
    reviewed_at: August 2026
    next_review_at: December 2028
    source_ids: [ref-field-sizing, ref-baseline]
    fallback: Explicit logical sizes.
  - id: anchor-positioning
    capability_id: native-disclosures
    status: newly
    reviewed_at: August 2026
    next_review_at: July 2028
    source_ids: [ref-anchor-module, ref-baseline]
    fallback: Conventional positioned layout or Popover API.
  - id: typed-attr
    capability_id: style-queries
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-attr, ref-baseline]
    fallback: A class, custom property, or ordinary attribute interpreted by the owner.
  - id: shape
    capability_id: experimental-css
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-shape, ref-baseline]
    fallback: polygon(), border radius, or a static asset.
  - id: corner-shape
    capability_id: experimental-css
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-corner-shape, ref-baseline]
    fallback: border-radius.
  - id: media-state-pseudo-classes
    capability_id: experimental-css
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-playing, ref-baseline]
    fallback: Owner-managed state class.
  - id: custom-highlights
    capability_id: experimental-css
    status: newly
    reviewed_at: August 2026
    source_ids: [ref-highlight, ref-baseline]
    fallback: Normal browser selection/find rendering.
  - id: scroll-state-queries
    capability_id: experimental-css
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-scroll-state-queries, ref-baseline]
    fallback: Owner-managed state class or no effect.
  - id: line-clamp
    capability_id: text-wrapping
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-line-clamp, ref-baseline]
    fallback: Show full content or provide an explicit disclosure.
  - id: round
    capability_id: fluid-type
    status: limited
    reviewed_at: August 2026
    source_ids: [ref-round, ref-baseline]
    fallback: Ordinary calc or precomputed value.
  - id: css-functions
    capability_id: experimental-css
    status: watchlist
    reviewed_at: August 2026
    source_ids: [ref-if, ref-function, ref-sibling-index, ref-sibling-count]
    fallback: Custom property values calculated by the build or owner code.