Bug 1966220 [wpt PR 52510] - [soft navs] Add smoke test for DOM modification support.,

Automatic update from web-platform-tests
[soft navs] Add smoke test for DOM modification support.

For now, this tests that we support Element.innerHTML, Node.appendChild, and Node.insertBefore, Document.importNode, Document.adoptNode, and template element.

This isn't a fix for the bug mentioned here, but hopefully some baby steps towards it. :-)

Bug: 328783345
Change-Id: I4be5de236acc8cf7da37a665b26c77f6f7f218ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6532832
Commit-Queue: Johannes Henkel <johanneschromium.org>
Reviewed-by: Michal Mocny <mmocnychromium.org>
Cr-Commit-Position: refs/heads/main{#1459667}

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wpt-commits: af1e34f8e178a17780fa230b01f4ecc13a83f107
wpt-pr: 52510

Differential Revision: https://phabricator.services.mozilla.com/D250158

UltraBlame original commit: 20d8e853dc7ec0cb847c4c34d1347a9f01d5f0fb

Author: marco-c