Make innerText getter not run the algorithm on the element itself

It was specified more like "outerText" -- a tab character would be
prepended when getting td.innerText, and br.innerText would return
a newline. This did not match any browser, and when Chromium
implemented the spec it was found to break some web content.

Tests: web-platform-tests/wpt#13743

Fixes #4119

Author: zcorpan

source

@@ -12595,14 +12595,25 @@ interface <dfn>DOMStringMap</dfn> {
     their text contents ignored.</p>
    </li>
 
+   <li><p>Let <var>results</var> be a new empty <span>list</span>.</p></li>
+
    <li>
-    <p>Let <var>results</var> be the <span>list</span> resulting in running the <span>inner text
-    collection steps</span> with this element. Each item in <var>results</var> will either be a
-    <span>JavaScript string</span> or a positive integer (a <i>required line break count</i>).</p>
+    <p>For each child node <var>node</var> of this element:</p>
+
+    <ol>
+     <li><p>Let <var>current</var> be the <span>list</span> resulting in running the <span>inner
+     text collection steps</span> with <var>node</var>. Each item in <var>results</var> will either
+     be a <span>JavaScript string</span> or a positive integer (a <i>required line break
+     count</i>).</p>
 
-    <p class="note">Intuitively, a <i>required line break count</i> item means that a certain number
-    of line breaks appear at that point, but they can be collapsed with the line breaks induced by
-    adjacent <i>required line break count</i> items, reminiscent to CSS margin-collapsing.</p>
+     <p class="note">Intuitively, a <i>required line break count</i> item means that a certain
+     number of line breaks appear at that point, but they can be collapsed with the line breaks
+     induced by adjacent <i>required line break count</i> items, reminiscent to CSS
+     margin-collapsing.</p>
+
+     <li><p>For each item <var>item</var> in <var>current</var>, append <var>item</var> to
+     <var>results</var>.</p></li>
+    </ol>
    </li>
 
    <li><p><span data-x="list remove">Remove</span> any items from <var>results</var> that are the