Force browser screen orientation

I'd like to display my website only in landscape mode when viewed from modern smartphones. Is there a way to force the major mobile browsers- Chrome/Firefox/Safari/IE10 to do so? Basically I'd like them to start the browser in landscape mode, irrespective of screen orientation and rotation lock.

Is it too much to ask? I think not because certainly there are games that only play in landscape mode, and the Windows Phone UI home screen uses only portrait mode.