Add test to verify "keep custom element registry null" behavior for shadowroot #56237
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wpt-pr-bot
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TakayoshiKochi,
hayatoito,
kojiishi,
rniwa and
snuggs
annevk
approved these changes
Nov 25, 2025
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Adding test to cover the behavior mentioned in whatwg/dom#1423 (comment)
cc @annevk @sorvell