I want to get X11 window Id of an browser window through JavaScript.
Also is there any ID associated with Div tag like Window X11 ID so that i can use it to display video stream in it.
Thanks.
That sort of information is not going to be accessible to JavaScript in the browser, not in any kind of cross-browser compatible way and especially not if you want to do this from a web page vs. an intranet page vs. a local HTML file (you haven't said either way).
For video streaming, you'll need to use HTML5 video or fall back to some kind of video streaming plug-in (most sites Flash for that).