Automatic update from web-platform-tests [Reference Target] Add test for middle root ID/reference changes Add test cases for multiply-nested shadow roots to ensure that changes to an element ID or reference target in a middle shadow can establish or break reference forwarding to a deeper shadow. Bug: 346835896 Change-Id: I2a3873f2ece2518bc5303b638e71bab6c13456ae Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8007785 Reviewed-by: Mason Freed <masonf@chromium.org> Commit-Queue: Dan Clark <daniec@microsoft.com> Cr-Commit-Position: refs/heads/main@{#1653527} -- wpt-commits: 3bf12aa50a29e20c664b7f5b55c133c68a7457e2 wpt-pr: 60937