For example, in the following abbreviated test HTML:
<span>some text</span>
<script>println("whf")</script>
We would have to craft the expectation file to include the "some text"
segment, usually with some leading whitespace. This is a bit annoying,
and makes it difficult to manually craft expectation files.
So instead of comparing the expectation against the entire DOM inner
text, we now send the inner text of just the <pre> element containing
the test output when we invoke `internals.signalTextTestIsDone`.
(cherry picked from commit bf668696de9a68bbcd6adfeaac809a475da015dc;
amended a bit but not as much as one might think -- see PR for details)
This ensures the HTML parser completes running if it previously stopped
at an insertion point during a call to `document.write`.
(cherry picked from commit 230314238655204b89dd0736da4537b475eb252a)
This fixes an issue where document.write() with only text input would
leave all the character data as unflushed text in the parser.
This fixes many of the WPT tests for document.write().
(cherry picked from commit a0ed12e839f14b3ac80caca0e18a09ca256fd99d)
