This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

The read-only property returns the MediaStream associated with the event.


 var stream =;


pc.onaddstream = function( ev ) {
                      alert("A stream (id: '" + 
                            "') has been added to this connection.");


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browser
The definition of '' in that specification.
Working Draft Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) Not supported (Yes) ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? Not supported ? ?

See also

Document Tags and Contributors

 Contributors to this page: fscholz, teoli
 Last updated by: fscholz,