CSSStyleRule 表示一条 CSS 样式规则。它实现了 CSSRule 接口，类型的值为 1（CSSRule.STYLE_RULE）。
属性
CSSStyleRule.selectorText- 返回这条规则的、文本格式的选择器，例如
"h1,h2"。 CSSStyleRule.style只读- 返回这条规则的
CSSStyleDeclaration对象。 CSSStyleRule.styleMap只读- 返回一个
StylePropertyMap对象，which provides access to the rule's property-value pairs.
规范
| 规范 | 状态 | 备注 |
|---|---|---|
| CSS Object Model (CSSOM) CSSStyleRule |
Working Draft | No changes |
| Document Object Model (DOM) Level 2 Style Specification CSSRule |
Obsolete |
浏览器兼容性
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