CSSStyleRule
CSSStyleRule represents a single CSS style rule. It implements the CSSRule interface with a type value of 1 (CSSRule.STYLE_RULE).
var CSSStyleRule: {
prototype: CSSStyleRule;
new (): CSSStyleRule;
};CSSStyleRule represents a single CSS style rule. It implements the CSSRule interface with a type value of 1 (CSSRule.STYLE_RULE).