[Webkit-unassigned] [Bug 175802] New: RTCPeerConnection addEventListener handler context changed (a new this?)

Mon Aug 21 17:48:46 PDT 2017

https://bugs.webkit.org/show_bug.cgi?id=175802

            Bug ID: 175802
           Summary: RTCPeerConnection addEventListener handler context
                    changed (a new this?)
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jiali.passion at gmail.com

The reproduce code is below.

<html>
  <head>
    <script>
      window.onload = function () {
          console.log('Create RTCPeerConnection')
          const pc = new RTCPeerConnection()

          console.log('Add "track" event listener')
          pc.addEventListener('track', function(_event) {
            console.log('this === pc', this === pc);
            console.log('track event', _event);
          });

          console.log('Dispatch "track" event')
          pc.dispatchEvent(new Event('track'))
      }
    </script>
  </head>
</html>

the output will be 

------------------------
this === pc, false

in the eventhandler of `track`, the context `this` is different with `pc`. 
In Firefox and Chrome, this is the same with pc.

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