CSSRule
public interface CSSUnknownRuleextends CSSRule
CSSUnknownRule
另见Document Object Model (DOM) Level 2 Style Specification 。
CHARSET_RULE, FONT_FACE_RULE, IMPORT_RULE, MEDIA_RULE, PAGE_RULE, STYLE_RULE, UNKNOWN_RULE
getCssText, getParentRule, getParentStyleSheet, getType, setCssText