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

The CSS.supports() static method returns a boolean value indicating if the browser supports a given CSS feature, or not.

Syntax

js
CSS.supports(propertyName, value)
CSS.supports(supportCondition)

Parameters

There are two distinct sets of parameters. The first one allows to test the support of a pair property-value:

propertyName

A string containing the name of the CSS property to check.

value

A string containing the value of the CSS property to check.

The second syntax takes one parameter matching the condition of @supports:

supportCondition

A string containing the condition to check.

Return value

true if the browser supports the rule, otherwise false.

Examples

In the following examples, result is a boolean value indicating if the browser supports the given CSS feature.

js
result = CSS.supports("text-decoration-style", "blink");
result = CSS.supports("display: flex");
result = CSS.supports("(--foo: red)");
result = CSS.supports("selector(:has(a))");
result = CSS.supports(
  "(transform-style: preserve) or (-moz-transform-style: preserve) or (-webkit-transform-style: preserve)",
);

For more examples and syntax features, see the @supports at-rule.

Specifications

Specification
CSS Conditional Rules Module Level 3
# dom-css-supports

Browser compatibility

See also