[Webkit-unassigned] [Bug 142954] New: img load event forgets img target when passed through Promise

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sun Mar 22 18:40:37 PDT 2015


            Bug ID: 142954
           Summary: img load event forgets img target when passed through
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bbirch at aconex.com

Wrapping image loading in a Promise does not work as expected.

After the image load event fires event.target contains a IMG element
When the promise is resolved event.target is null

It can be worked around by resolving the promise with event.target rather than event

Here is a demonstration 


Fails in Safari and webkit nightly 
In Firefox the code works as expected
In Chrome there is also a bug, however it is slightly different in that the last promise to resolve in a group still remembers the target, but others are null

Here is a variation on the demonstration


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