CSSRule: { CHARSET_RULE: number; FONT_FACE_RULE: number; IMPORT_RULE: number; KEYFRAMES_RULE: number; KEYFRAME_RULE: number; MEDIA_RULE: number; NAMESPACE_RULE: number; PAGE_RULE: number; STYLE_RULE: number; SUPPORTS_RULE: number; prototype: CSSRule; new (): CSSRule; }