Automatic update from web-platform-tests
De-flake moving-between-documents WPTs
The moving-between-documents tests were flakily timing out with:
"TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is
not of type 'Node'."
This occurred because the helper script's createDocument resolved the
promise as soon as it received the "fox" message from the iframe.
However, the "fox" message is sent from the iframe's <head> before the
<body> (which contains the <streaming-element>) is parsed. If the iframe
parser yielded, the parent would query for <streaming-element> before it
was parsed, returning null and causing appendChild to fail.
This CL fixes the issue by using a MutationObserver in the helper's
createDocument function. If inlineOrExternal indicates that a
<streaming-element> is expected, we wait for it to be added to the DOM
before resolving the promise.
Fixed: 523277473, 522214584, 523168886, 523251891, 523126244, 523121069, 523114956, 522599272, 523301970
Change-Id: Ibf610fa6a84a1c12508feb40863248120cc71a57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7934311
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Helmut Januschka <helmut@januschka.com>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1646873}
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wpt-commits: 9b2b429304ed446135e76f2fc855b6dbbbaf2fa2
wpt-pr: 60644
Joey Arhar
2fcbfc1a93