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CSSSupportsRule

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨September 2015⁩.

The CSSSupportsRule interface represents a single CSS @supports at-rule.

Instance properties

Inherits properties from its ancestors CSSConditionRule, CSSGroupingRule, and CSSRule.

Instance methods

Inherits methods from its ancestors CSSConditionRule, CSSGroupingRule, and CSSRule.

Examples

The CSS includes a CSS feature query using the @supports at-rule, containing one style rule. This will be the first CSSRule returned by document.styleSheets[0].cssRules. myRules[0] therefore returns a CSSSupportsRule object.

@supports (display: grid) {
  body {
    color: blue;
  }
}

let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0]); // a CSSSupportsRule representing the feature query.

Specifications

Specification
CSS Conditional Rules Module Level 3> # the-csssupportsrule-interface>

Browser compatibility