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CSSStyleRule

CSSStyleRule represents a single CSS style rule. It implements the CSSRule interface with a type value of 1 (CSSRule.STYLE_RULE).

The syntax is described using the WebIDL format.

interface CSSStyleRule : CSSRule {
    attribute DOMString selectorText;
    readonly attribute CSSStyleDeclaration style;
};

CSSStyleRule.selectorText: Gets the textual representation of the selector for this rule, e.g. "h1,h2".
CSSStyleRule.style: Returns the CSSStyleDeclaration object for the rule.

Specification	Status	Comment
CSS Object Model (CSSOM) The definition of 'CSSStyleRule' in that specification.	Working Draft	No changes
Document Object Model (DOM) Level 2 Style Specification The definition of 'CSSRule' in that specification.	Obsolete

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	Yes	Yes	9	Yes	Yes
`selectorText`	Yes	Yes	61 61 ? — 61 Read-only; setting of this property not supported.	9	Yes	Yes
`style`	Yes	Yes	Yes	9	Yes	Yes

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	Yes	Yes	Yes	Yes	?
`selectorText`	Yes	Yes	Yes	61 61 ? — 61 Read-only; setting of this property not supported.	Yes	Yes	?
`style`	Yes	Yes	Yes	Yes	Yes	Yes	?

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https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleRule