Bug 68703

Summary: MouseEvents need to take into account CSS transforms for correct PageX and PageY
Product: WebKit Reporter: John Knottenbelt <jknotten>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED WONTFIX    
Severity: Normal CC: fsamuel, simon.fraser
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 68075    

Description John Knottenbelt 2011-09-23 10:27:36 PDT 
If the HTML element has a -webkit-transform property, the mouse events need to take this into account when calculating the pageX / pageY coordinates.
Comment 1 John Knottenbelt 2011-09-23 10:58:24 PDT 
Please also see https://bugs.webkit.org/show_bug.cgi?id=67592
Comment 2 Simon Fraser (smfr) 2011-09-23 20:32:19 PDT 
Why is the HTML element special? I don't think a transform on the HTML element should affect pageX/pageY.
Comment 3 John Knottenbelt 2011-09-26 01:14:12 PDT 
Simon, I think that makes sense to me. If I understand correctly, we can mark this bug as invalid:

A css transform on the HTML element is no different to a css transform on any other content element, for example a <div>. We wouldn't expect a css transform on a <div> to affect the PageX and PageY mouse coordinates, and similarly the html element is no exception. A transform on the HTML element changes the coordinates of the top left corner of the HTML element, but not the document itself. PageX and PageY coordinates are relative to the top-left corner of the document.
Comment 4 Simon Fraser (smfr) 2011-09-26 10:15:35 PDT 
Sounds good.