Bug 142954 – img load event forgets img target when passed through Promise

• Status: NEW
• Component: DOM

[Ben]

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 

http://jsfiddle.net/8ys0dn4x/1/

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

http://jsfiddle.net/d13sf3f2/5/

[Ben]

Minimal test case

(new Promise( function( resolve ) {
    var i = document.createElement("IMG");
    i.onload = function( event ) {
        console.log("onload", event.target ); // -> <img ...>
        resolve(event);
    };
    i.src = "http://i.imgur.com/waV028T.jpg";
})).then( function( resolved_event ) {
    console.log( resolved_event.target ); // -> null
});

[Lucas Forschler]

Mass move bugs into the DOM component.

[Ahmad Saleem]

It seems to work for me and matching with Chrome Canary 127.

Test case from Comment 0 shows two console message across all browsers (Safari 17.5 , Chrome Canary 127 and Firefox Nightly 128).