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You can tell that the origin trial is enabled and CSS.supports() isn't
working as expected because of the document.body.onbeforematch check in
the first assert.

Bug: 1134237
Change-Id: I992e05dcf3cb0a3d07fcc1aedb1efb67630b9b1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2447051Reviewed-by: Jason Chase <chasej@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Auto-Submit: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815233}