If a content element has a value for select, then the custom shadowDom implementation does a querySelector all for that value. It should only be selecting direct children and not all descendants (e.g. select="*" selects all descendents of the instance to the insertion point).
If a content element has a value for select, then the custom shadowDom implementation does a querySelector all for that value. It should only be selecting direct children and not all descendants (e.g. select="*" selects all descendents of the instance to the insertion point).