Limited availability
The styleMap read-only property of the CSSStyleRule interface returns a StylePropertyMap object which provides access to the rule's property-value pairs.
A StylePropertyMap object.
The following example shows styleMap being used to modify a style using the StylePropertyMap.set() method.
const stylesheet = document.styleSheets[0];
Object.values(stylesheet.cssRules).forEach((block) => {
if (block.selectorText === "button") {
block.styleMap.set("--main-color", "black");
}
});
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