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

@foolip commented on this pull request.

A bunch of style changes to keep this spec's more archaic style, and also to match how the algorithms are invoked with how it's done in HTML.

> +[=Request removal from the top layer=] for |element| from its [=node document=], then
+[=add to the top layer|add it to the top layer=] of its [=node document=].

```suggestion
<a>Request removal from the top layer</a> given |element|'s <a>node document</a> and |element|, then
<a>add to the top layer</a> given |element|'s <a>node document</a> and |element|.
```

> @@ -56,21 +57,22 @@ stated otherwise it is unset.
 
 <p>All <a for=/>documents</a> have an associated <dfn export>fullscreen element</dfn>. The
 <a>fullscreen element</a> is the topmost <a>element</a> in the <a for=/>document</a>'s
-<a>top layer</a> whose <a>fullscreen flag</a> is set, if any, and null otherwise.
+[=Document/top layer=] whose <a>fullscreen flag</a> is set, if any, and null otherwise.

```suggestion
<a for=Document>top layer</a> whose <a>fullscreen flag</a> is set, if any, and null otherwise.
```

> @@ -81,7 +83,7 @@ its <a>node document</a>'s <a>top layer</a>.
  <li><p>If <var>document</var>'s <a>fullscreen element</a> is null, terminate these steps.
 
  <li><p><a lt="unfullscreen an element">Unfullscreen elements</a> whose <a>fullscreen flag</a> is
- set, within <var>document</var>'s <a>top layer</a>, except for <var>document</var>'s
+ set, within <var>document</var>'s [=Document/top layer=], except for <var>document</var>'s

```suggestion
 set, within <var>document</var>'s <a for=Document>top layer</a>, except for <var>document</var>'s
```

> +    <p>If <var>document</var>'s [=Document/top layer=] <a for=set>contains</a> <var>node</var>,
+    <a>remove from the top layer immediately</a> <var>node</var> from <var>document</var>'s
+    [=Document/top layer=].

```suggestion
    <p>If <var>document</var>'s <a for=Document>top layer</a> <a for=set>contains</a> <var>node</var>,
    <a>remove from the top layer immediately</a> given <var>document</var> and <var>node</var>.
```

>  
-    <p class=note>Other specifications can add and remove elements from <a>top layer</a>, so
+    <p class=note>Other specifications can add and remove elements from [=Document/top layer=], so

```suggestion
    <p class=note>Other specifications can add and remove elements from <a for=Document>top layer</a>, so
```

> @@ -400,9 +403,9 @@ getter steps are:
 </div>
 
 <p>A <a>document</a> is said to be a <dfn>simple fullscreen document</dfn> if there is exactly one
-<a>element</a> in its <a>top layer</a> that has its <a>fullscreen flag</a> set.
+<a>element</a> in its [=Document/top layer=] that has its <a>fullscreen flag</a> set.

```suggestion
<a>element</a> in its <a for=Document>top layer</a> that has its <a>fullscreen flag</a> set.
```

>  
-<p class=note>A <a>document</a> with two <a>elements</a> in its <a>top layer</a> can be a
+<p class=note>A <a>document</a> with two <a>elements</a> in its [=Document/top layer=] can be a

```suggestion
<p class=note>A <a>document</a> with two <a>elements</a> in its <a for=Document>top layer</a> can be a
```

> @@ -436,7 +439,7 @@ could be an open <{dialog}> element.
 
  <p class=note>This is the set of documents for which the <a>fullscreen element</a> will be
  <a lt="unfullscreen an element">unfullscreened</a>, but the last document in <var>docs</var> might
- have more than one <a>element</a> in its <a>top layer</a> with the <a>fullscreen flag</a> set,
+ have more than one <a>element</a> in its [=Document/top layer=] with the <a>fullscreen flag</a> set,

```suggestion
 have more than one <a>element</a> in its <a for=Document>top layer</a> with the <a>fullscreen flag</a> set,
```

> @@ -745,6 +661,13 @@ delivered with the <a>document</a> through which it is nested.
 <p>This prevents e.g. content from third parties to go fullscreen without explicit permission.
 
 
+<h2 id=old-links class=no-num oldids="new-stacking-layer, top-layer, top-layer-add, ::backdrop-pseudo-element, css-pe-backdrop">
+Appendix A: Previously-Hosted Definitions</h2>
+
+This specification previously hosted the definitions of <a selector>::backdrop</a>
+and the concept of the document's [=Document/top layer=].

```suggestion
and the concept of the document's <a for=Document>top layer</a>.
```

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