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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/CSS/supports_static below:

CSS: supports() static method - Web APIs

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

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

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.

true if the browser supports the rule, otherwise false.

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

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.

• The @supports at-rule that allows for the same functionality but in a declarative way.
• The CSSSupportsRule CSSOM class allowing to manipulate @supports at-rules.

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