The CSSRule.selectorText
property gets the textual representation of the selector for the rule set. This is implemented in a readonly manner; to set stylesheet rules dynamically, see Using dynamic styling information.
string = cssRule.selectorText
// for cssrule: body { background-color: darkblue; } var stylesheet = document.styleSheets[0]; alert(stylesheet.cssRules[0].selectorText); // body
The implementation may have stripped out insignificant whitespace while parsing the selector.
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https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleRule/selectorText