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This command takes a DOM node and a name and/or role to search for.
It searches the accessibility subtree of the given node for the name
and role. The command also includes ignored nodes in its result.

The command is the underlying primitive for a new aria-based
querying mechanism in Puppeteer.
This CL is a follow-up to crrev.com/c/2366896. The feedback given there
has been addressed in this CL.

Doc: https://docs.google.com/document/d/1-BUEUgqAZlh26fv9oLfy1QRr0MF3ifnxGh7-NDucg9s/
Change-Id: Ibdcdb230b5d1287ab009f2dd9d25a53932072d6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398547
Commit-Queue: Johan Bay <jobay@google.com>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Chris Hall <chrishall@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809251}