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[Bug 26013] New: Note in "10 Pointer Capture" to mention implicit pointer capture

From: <bugzilla@jessica.w3.org>
Date: Sun, 08 Jun 2014 00:39:06 +0000
To: public-pointer-events@w3.org
Message-ID: <bug-26013-5978@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=26013

            Bug ID: 26013
           Summary: Note in "10 Pointer Capture" to mention implicit
                    pointer capture
           Product: PointerEventsWG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Pointer Events specification
          Assignee: jrossi@microsoft.com
          Reporter: redux@splintered.co.uk
        QA Contact: public-pointer-events-bugzilla@w3.org
                CC: public-pointer-events@w3.org

As discussed on list
http://lists.w3.org/Archives/Public/public-pointer-events/2014AprJun/0087.html
I'd propose adding a note to "10. Pointer Capture" in the introductory section,
after Fig 4: (slightly altered from my original suggestion)

"NOTE: browsers MAY implement their own implicit pointer capture behaviour -
for instance, for touch interactions, a browser may automatically capture the
pointer as part of a tap on a native form control (such as a button) to improve
user interaction (allowing some finger movement to stray outside of the form
control itself during the tap action). As part of this behaviour, browsers MAY
fire <code>gotpointercapture</code> and <code>lostpointercapture</code> events,
even though no explicit pointer capture functions
(<code>setPointerCapture</code> and <code>releasePointerCapture</code>) were
called."

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