[Webkit-unassigned] [Bug 126680] New: Incorrect this value for callbacks (like requestAnimationFrame)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126680

           Summary: Incorrect this value for callbacks (like
                    requestAnimationFrame)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://jsfiddle.net/3BLzU/2/
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bzbarsky at mit.edu


Steps to reproduce: Load this testcase:

  <script>
    function f() { "use strict"; alert(this + ""); }
    requestAnimationFrame(f);
  </script>

Expected result:  Alert saying either "null" or "undefined", preferably the latter.

Actual result: Alert saying 'function f() { "use strict"; alert(this + ""); }'

Additional information:

Per WebIDL spec, the callback this value is set to null, by default, though it should probably be undefined instead (see <https://www.w3.org/Bugs/Public/show_bug.cgi?id=24248>).  The requestAnimationFrame specification doesn't say to pass any special this value.  So in this case the this value should be undefined, or at worst null, not the function object being called.

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