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supports-css

v0.3.0

Published

Live, in-browser detection of modern CSS support for selectors, features, and at-rules. Applies support-based classes, exposes a results object, and allows custom tests.

Downloads

197

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

5t3ph5t3ph

Keywords

css@supportscss supporttestingstylesmodern cssbrowser supportfeature detection

Readme

SupportsCSS

Live, in-browser detection of modern CSS support for selectors, features, and at-rules. Applies support-based classes, exposes a results object, and allows custom tests.

Inspired by the legacy of Modernizr, this script evaluates a user's browser for cutting-edge modern CSS support beyond the capabilities of @supports.

  • Classes are added to <html> as either supports-[feature] or no-[feature], allowing easier progressive enhancement and build strategies
  • Checks for selectors like :has(), properties like text-box-trim, features like relative color syntax, and at-rules like @layer - see full test suite
  • Allows adding custom tests
  • Exposes a results object to iterate over detected support, as well as individual results for quick conditional checks in JS

SupportsCSS is not a polyfill, it is only feature detection. Continue using tools like PostCSS or LightningCSS for prefixing and other features like syntax lowering. SupportsCSS is a layer on top of those tools.

Installation & Usage

Review the full docs at SupportsCSS.dev.

Test Suite

| Feature Class | Global Name | Test Condition | |---|---|---| | at-container | AtContainer | window.CSSContainerRule | | at-container-style-properties | AtContainerStyleProperties | * See explanation | | at-counter-style | AtCounterStyle | window.CSSCounterStyleRule | | at-layer | AtLayer | window.CSSLayerBlockRule | | at-property | AtProperty | window.CSSPropertyRule | | at-scope | AtScope | window.CSSScopeRule | | at-starting-style | AtStartingStyle | window.CSSStartingStyleRule | | anchor-positioning | AnchorPositioning | CSS.supports('anchor-name: --a') | | color-function | ColorFunction | CSS.supports('color: color(srgb 0 0 1)') | | color-mix | ColorMix | CSS.supports('color: color-mix(in lch, white, black)') | | container-units | ContainerUnits | CSS.supports('width: 1cqi') | | dynamic-viewport-units | DynamicViewportUnits | CSS.supports('width: 1dvi') | | has | Has | CSS.supports('selector(:has(+ *))') (Possible false positive in Firefox 112) | | houdini-paint-api | HoudiniPaintApi | window.CSS.paintWorklet | | individual-transforms | IndividualTransforms | CSS.supports('transform: scale(1)') | | light-dark | LightDark | CSS.supports('color: light-dark(black, white)') | | logical-properties | LogicalProperties | CSS.supports('border-start-start-radius: 1px') | | media-range-syntax | MediaRangeSyntax | window.matchMedia('(width >= 1px)') | | nesting | Nesting | CSS.supports('selector(& a)') | | nth-of-s | NthOfS | CSS.supports('selector(:nth-child(1 of .a))') | | overscroll-behavior | OverscrollBehavior | CSS.supports('overscroll-behavior: none') | | relative-color-syntax | RelativeColorSyntax | CSS.supports('color: rgb(from red r g b / 1%)') | | scroll-timeline | ScrollTimeline | CSS.supports('scroll-timeline-name: --a') | | subgrid | Subgrid | CSS.supports('grid-template-rows: subgrid') | | text-box-trim | TextBoxTrim | CSS.supports('text-box-trim: both') | | trigonometry | Trigonometry | CSS.supports('width: calc(1px * cos(1deg))') | | user-invalid | UserInvalid | CSS.supports('selector(:user-invalid)') | | user-valid | UserValid | CSS.supports('selector(:user-valid)') | | view-timeline | ViewTimeline | CSS.supports('view-timeline-name: --a'), | | view-transitions | ViewTransitions | window.ViewTransition |

How were these features selected?

Features were selected based on:

  • @supports limitations
  • instability of the spec
  • freshness to the language
  • impact on CSS architecture
  • impact on progressive enhancement

Colophon

Created by Stephanie Eckles, author of ModernCSS.dev, SmolCSS.dev, and other front-end dev resources.