HTML parser: make breaking out of foreign content apply in innerHTML

This is intended to match Chromium and WebKit.

Fixes #5117.

source

@@ -111047,23 +111047,12 @@ document.body.appendChild(text);
    <dd>
     <p><span>Parse error</span>.</p>
 
-    <!-- for sanity's sake, we limit this wacked quirk to legacy full-document parsing, not to
-    innerHTML. We have no data showing whether (or that) this is needed for innerHTML. If innerHTML
-    is used on an SVG or MathML node, it definitely doesn't make any sense (there's nothing to pop
-    to in the first place). Therefore, rather than trying to figure out in what convoluted
-    conditions we could actually do this quirk for innerHTML, we just don't do it at all. -->
+    <p>While the <span>current node</span> is not a <span>MathML text integration point</span>, an
+    <span>HTML integration point</span>, or an element in the <span>HTML namespace</span>, pop
+    elements from the <span>stack of open elements</span>.</p>
 
-    <p>If the parser was created as part of the <span>HTML fragment parsing algorithm</span>, then
-    act as described in the "any other start tag" entry below. (<span>fragment case</span>)</p>
-
-    <p>Otherwise:</p>
-
-    <p>Pop an element from the <span>stack of open elements</span>, and then keep popping more
-    elements from the <span>stack of open elements</span> until the <span>current node</span> is a
-    <span>MathML text integration point</span>, an <span>HTML integration point</span>, or an
-    element in the <span>HTML namespace</span>.</p>
-
-    <p>Then, reprocess the token.</p>
+    <p>Process the token <span>using the rules for</span> the "<span data-x="insertion mode:
+    in body">in body</span>" <span>insertion mode</span>.</p>.</p>
    </dd>
 
    <dt>Any other start tag</dt>