Re: [whatwg/fullscreen] Remove top layer definitions, now that CSS Position 4 contains them. (PR #223)

@tabatkins commented on this pull request.



>  
 <p>All <a for=/>documents</a> have an associated <dfn>list of pending fullscreen events</dfn>, which
 is an <a>ordered set</a> of (<a>string</a>, <a>element</a>) <a>tuples</a>. It is initially empty.
 
-<p>To <dfn>fullscreen an <var>element</var></dfn>, set <var>element</var>'s <a>fullscreen flag</a>
-and <a for="top layer">add</a> it to its <a>node document</a>'s <a>top layer</a>.
+<p>To <dfn>fullscreen an <var>element</var></dfn>, set <var>element</var>'s <a>fullscreen flag</a>.
+If <var>element</var> is not currently [=in the top layer=] of its <a>node document</a>,

It seems like the behavior we're going for, actually, is that an element can only be in the top layer for one reason at a time, so actually this might need to change a little more to properly reflect that. (And possibly allow it to be moved if it's currently in the top layer for fullscreen reasons, as per your comment.)

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