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parentRule (attribute )

Owning interface and usage:  
CSSRule.parentRule

Member of these other interfaces:  
CSSCharsetRule, CSSFontFaceRule, CSSImportRule, CSSMediaRule, CSSPageRule, CSSStyleRule, CSSUnknownRule

Readonly:   yes

Type:   CSSRule

Description:  
If this rule is contained inside another rule (e.g. a style rule inside an @media block), this is the containing rule. If this rule is not nested inside any other rules, this returns null.