Bug 1912516 [wpt PR 47551] - Implement selectedoptionelement attribut…

…e, a=testonly

Automatic update from web-platform-tests
Implement selectedoptionelement attribute

This was resolved here: openui/open-ui#1063

Change-Id: Ie7f464b8cbacbe9614a2e7d34ccf1805a93f3bbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5763175
Commit-Queue: Joey Arhar <jarharchromium.org>
Reviewed-by: Mason Freed <masonfchromium.org>
Cr-Commit-Position: refs/heads/main{#1339783}

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wpt-commits: e8ac9bf69400e3a634aa592633c4fb51bd7fda6f
wpt-pr: 47551

UltraBlame original commit: 3e5ca2209a1faf47be352c5060f6890ab1748372