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http://wpt.fyi/html/semantics/interactive-elements/the-dialog-element/dialog-close.html

Looks like other browsers still haven't shipped <dialog>. In Firefox, there's a pref in about:config dom.dialog_element.enabled, and then it passes the test. It would be good to have interop on this when Firefox ships.

Gecko bug for <dialog>: https://bugzilla.mozilla.org/show_bug.cgi?id=840640

We have a failure because of this:
http://wpt.fyi/html/semantics/interactive-elements/the-dialog-element/dialog-close.html

Attempting fix i https://chromium-review.googlesource.com/648980

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf

commit ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf
Author: Philip Jägenstedt <foolip@chromium.org>
Date: Tue Sep 05 07:56:57 2017

Make dialog.close() a no-op when already closed

This matches the standard:
https://html.spec.whatwg.org/multipage/interactive-elements.html#close-the-dialog

https://crbug.com/761790 was filed about the fact that we appear to
have a much better test suite for <dialog> than exists in
web-platform-tests.

Drive-by: resolve the FIXME about default argument value for close(),
and remove the stale FIXME that is no longer correct.

Bug:  638943 
Change-Id: I82743f7d725ed85c42c9e349b669f098b5a3e10d
Reviewed-on: https://chromium-review.googlesource.com/648980
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499581}
[delete] https://crrev.com/2e441c8f0b0aa36b0eb7a6f05a0e498c5a1c04ac/third_party/WebKit/LayoutTests/external/wpt/html/semantics/interactive-elements/the-dialog-element/dialog-close-expected.txt
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/LayoutTests/html/dialog/dialog-open-expected.txt
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/LayoutTests/html/dialog/dialog-open.html
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/LayoutTests/html/dialog/dialog-return-value-expected.txt
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/LayoutTests/html/dialog/dialog-return-value.html
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/Source/core/html/HTMLDialogElement.cpp
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/Source/core/html/HTMLDialogElement.h
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/Source/core/html/HTMLDialogElement.idl
[modify] https://crrev.com/ad699f89ba8bc3c0bbbc61c122df8c632aa3a5cf/third_party/WebKit/Source/core/html/HTMLFormElement.cpp