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The feature is disabled by default and is not subject to an active
experiment.

It's not publicly documented, so there's little chance web developers
use is.

Bug: 1007974, 869912
Change-Id: I7233fd8a21e583247868433b049996dfde843bb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410403Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#810283}