Re: [whatwg/fullscreen] Reinstate the hierarchy restrictions (#91)

upsuper commented on this pull request.



> @@ -182,6 +182,12 @@ if all of the following are true, and false otherwise:
 <ul>
  <li><p><var>element</var> is <a>connected</a>.
 
+ <li><p><var>element</var>'s <a>node document</a>'s <a>fullscreen element</a> is null, or is an
+ <a>inclusive ancestor</a> of <var>element</var>.

You also need to invoke this check recursively for its browsing context container if any.

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