CSSCounterStyleRule.name

The name property of the CSSCounterStyleRule interface gets and sets the <custom-ident> defined as the name for the associated rule.

A CSSOMString

The following example shows a @counter-style rule. In JavaScript, myRules[0] is this @counter-style rule, returning name gives us the custom ident "box-corner".

@counter-style box-corner {
  system: fixed;
  symbols: ◰ ◳ ◲ ◱;
  suffix: ': ';
  fallback: disc;
}

let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].name); // "box-corner"