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Re: Request for Review: Multi-touch test cases; deadline December 4

From: Rick Byers <rbyers@google.com>
Date: Thu, 6 Dec 2012 15:50:27 -0500
Message-ID: <CAFUtAY-nkOX0AMFY7FpGZz-pZ4UjtuQx3QqOb9_CfgnDfTMm2Q@mail.gmail.com>
To: Arthur Barstow <art.barstow@nokia.com>, "Chan Cathy (Nokia-CIC/Boston)" <Cathy.Chan@nokia.com>
Cc: "public-webevents@w3.org" <public-webevents@w3.org>
Sorry for the delay.  I've done a quick review of these tests, and I think
they're great!  Thanks so much Cathy!

I've also run them on Chrome desktop (which is slightly different than
Chrome for Android) and the results are consistent with the other WebKit

I'm sorry I forgot that I was going to look further into the clientX/Y
issues on mobile safari.  I'll try to take a look in the next couple days.


On Tue, Nov 27, 2012 at 9:52 AM, Arthur Barstow <art.barstow@nokia.com>wrote:

> This is a Request for Review (RfR) of Cathy's multi-touch tests <
> http://w3c-test.org/**webevents/tests/touch-events-**v1/submissions/Nokia/<http://w3c-test.org/webevents/tests/touch-events-v1/submissions/Nokia/>
> >.
> If you have any comments, please send them by December 4.
> If you review any set of the tests and find no issues, please state that
> as a reply to this RfR (so we can get a sense of whether or not anyone
> reviewed the tests).
> In the absence of any comments, these tests will be considered Approved
> and hence used in the Candidate interop testing.
> -Thanks, AB
> -------- Original Message --------
> Subject:        Multi-touch test cases
> Resent-Date:    Mon, 26 Nov 2012 21:13:02 +0000
> Resent-From:    <public-webevents@w3.org>
> Date:   Mon, 26 Nov 2012 21:12:29 +0000
> From:   ext Cathy.Chan@nokia.com <Cathy.Chan@nokia.com>
> To:     <public-webevents@w3.org>
> Hi all,
> Here's my attempt at some multi-touch test cases. The tests can be found at
> http://w3c-test.org/webevents/**tests/touch-events-v1/**submissions/Nokia<http://w3c-test.org/webevents/tests/touch-events-v1/submissions/Nokia>
> .
> I took a different approach than what we did with the single-touch case by
> having several test files targeted at different aspects. You can find the
> following test files at the above location.
> create-touch-touchlist.html - tests the createTouch and createTouchList
> APIs.
> (This actually extends but also overlaps some of the test cases in the
> single-touch test file. We might consider removing the overlapping cases
> from
> the single-touch file.)
> multi-touch-interfaces.html - tests the implementation of various
> interfaces
> (Touch, TouchList and the various events)
> multi-touch-interactions.html - tests the relationship between Touch events
> received over time (e.g. how the touch lists in a touch event relates to
> those
> received before it etc). Although I included a specific touch pattern in
> this
> test, the test actually works for any touch pattern.
> I've run the tests on a few browsers/devices (the useful ones being
> Chrome/Firefox/Opera on Android and Mobile Safari on iPad). Most of the
> failures are related to issues already exposed by the single-touch test:
> - identifiedTouch is missing from WebKit implementations (Mobile Safari,
> Chrome on Android).
> - WebKit implementations (Mobile Safari on iPad, Chrome on Android)of
> createTouchList does not support an array as input parameter
> (https://bugs.webkit.org/show_**bug.cgi?id=97418<https://bugs.webkit.org/show_bug.cgi?id=97418>
> ).
> - with Firefox on Android and Safari on iPad, the clientX/Y check fails.
> A notable multi-touch specific observation:
> - with Mobile Safari on iPad, with the touch pattern stated in the test
> file,
> assertions and sometimes fail. It appears that when
> multiple
> fingers are lifted simultaneously, the UA sometimes dispatches the "same"
> touchend event to the different targets, where touches is the same but
> changedTouches and targetTouches vary according to the target element. In
> particular, changedTouches contains only those touches that were removed
> from
> the touch surface, and originated from the target element. This contradicts
> the definition in the spec that "For the touchend and touchcancel events
> this
> must be a list of the touch points that have just been removed from the
> surface.", which to me reads "regardless of where they started". When these
> "same" touchend events are processed one after another, the behavior
> becomes
> different than the expected behavior. To see this in action, uncomment the
> commented statement in debug_print() at the top of
> multi-touch-interactions.js. (It would probably take several attempts to
> see a
> failure. It all depends on the timing of removing the fingers and possibly
> also internal timing on the device itself.)
> [I also tried these tests on Firefox on N9, the stock WebKit browser on N9
> and
> Opera on Symbian, but encountered rather surprising behaviors such as not
> able
> to get multi-touch to work at all on Firefox/N9, and not more than two
> touches
> on Opera/Symbian. Seeing that these vendors probably are no longer actively
> developing for these platforms, I assume there's little point in pursuing
> the
> issues.]
> On a per browser/engine basis, the results look like this.
> - Opera on Android passes all tests.
> - Firefox on Android fails only on the clientX/Y check.
> - WebKit (Chrome and Mobile Safari) has issues with identifiedTouch and
> createTouchList with arrays.
> - Additionally Mobile Safari has issues with the clientX/Y check, as well
> as
> when multiple touch points that originate on different elements are removed
> from the touch surface simultaneously.
> To have at least two passing implementations, we would need either the
> clientX/Y assertions fixed in the test (I remember Rick said it could have
> been an issue with the test itself and not the browsers), or the
> identifiedTouch and createTouchList issues fixed in WebKit.
> Comments, flames, suggestions are welcome.
> Regards, Cathy.
Received on Thursday, 6 December 2012 20:51:17 UTC

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