## parent_rule property


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.

### See Also
* module [`aspose.html.dom.css`](../../)
* class [`ICSSUnknownRule`](/html/python-net/aspose.html.dom.css/icssunknownrule)