(Declarative Shadow DOM) Use shadowroot attribute value from open tag #22303
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Prior to this CL, the "shadowroot" attribute from the <template>
DOM node would be read back upon encountering the closing tag,
to determine whether to attach a shadow root. To better align with
the spec, with this CL, the "shadowroot" token attribute from the
opening <template shadowroot> tag is used instead.
This CL also starts to add testing of declarative shadow DOM.
Bug: 1042130
Change-Id: I0f52a3baa4c1f11d4cce7d1001ec80a31f139e48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106737
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752169}