Screen width/height issues

[halliwell-g]

Currently it's not possible for a page to detect the display's resolution capability for video display. A few things to note:

• decode height/width capability can be independent of screen height/width.
• window.screen/width is defined in css pixels, not physical pixels.
• additionally, some hardware displays video in separate plane which may have different resolution than graphics.

[ddorwin]

For the third item, see also #15.

[jpiesing]

21:9 TV sets come and go. When Philips last did 21:9 sets, the video would fill the entire 21:9 area of the display but graphics was in a separate plane which was the centre 16:9 of the 21:9.

[mounirlamouri]

It sounds to me that this is a duplicate of #25. Please, reopen if I misunderstood.