Bug 8150

Summary: Click is registered only if mouse pointer is fully stationary while mouse button is down (except for link and button)
Product: WebKit Reporter: Aapo Laitinen <aapo-bugzilla>
Component: DOMAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ahmad.saleem792, a_protyasha, grahamperrin, ian
Priority: P2    
Version: 420+   
Hardware: Mac   
OS: OS X 10.4   
Attachments:
Description Flags
Test case none

Aapo Laitinen
Reported 2006-04-03 00:15:21 PDT
The click event handler attached to an element such as a table cell or a paragraph will fire only if the mouse pointer remains perfectly stationary while the mouse button is held down. However, click event handlers attached to links and buttons are fired even if the mouse moves a bit while the button is down. It is very easy to move the mouse a couple of pixels while clicking. Not having any allowance at all makes Safari seem unresponsive. All elements should have at least some degree of allowance in regards to detecting clicks. For consistency, it might be best if they were very liberal in this regard, like buttons. Strictly speaking the current behaviour is according to the standards: "A click is defined as a mousedown and mouseup over the same screen location." http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-eventgroupings-mouseevents However, it is clear that being overly strict here is bad for usability and accessibility, not to mention inconsistent. Mozilla and Opera have thus chosen ignore this bit. The workaround is to simulate the click event with mousedown and mouseup. Tested in nightly that was downloaded on 2006-04-03. Attaching a test case.
Attachments
Test case (1.42 KB, text/html)
2006-04-03 00:15 PDT, Aapo Laitinen 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Aapo Laitinen
Comment 1 2006-04-03 00:15:57 PDT
Created attachment 7480 [details] Test case
Alexey Proskuryakov
Comment 2 2006-05-03 06:29:31 PDT
Yes, onclick is called in Mozilla an WinIE as long as mousedown and mouseup are in the same object, regardless of how much the mouse pointer has moved. Of course, they don't agree on what to do with drag&drop or when the two objects have parent-child relationship.
Darin Adler
Comment 3 2007-01-26 09:35:29 PST
The patch for bug 12133 resolved part of this problem. We should make a layout test so it doesn't regress, and fix the third case cited in this bug too.
Ahmad Saleem
Comment 4 2023-10-21 03:30:24 PDT
I am able to click all three and also few pixels away before releasing mouse. @Alexey - Is it reproducible to you? CCing - Abrar as well, since he is recently doing lot of work on event handling.
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