706555 - HTML5 fullscreen doesn't support extended monitors

Status: RESOLVED WONTFIX

(Core :: DOM: Core & HTML, defect)

Description

[Paul [pwd]]

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:11.0a1) Gecko/20111130 Firefox/11.0a1
Build ID: 20111130031011

Steps to reproduce:

Flash allows users to have a video full screen in one monitor while doing other web tasks (i.e. surfing) in another. When doing this with HTML5 video however, fullscreen is lost.

Comment 1

[Mihaela Velimiroviciu (:mihaelav)]

Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120226 Firefox/13.0a1

http://www.robwinters.co.uk/lab/html5/video/drag-and-resize.htm

Confirming this issue with HTML5 videos.
There is a similar issue with Flash videos (bug 565579)

Comment 2

[Chris Pearce [:cpearce (Not reading bugmail)]]

This is intentional. We exit fullscreen upon window "deactivate" (losing app focus) to ensure that a malicious web page can't pretend to be your desktop background.

Starting with Firefox 13 (i.e. current nightly builds) you can disable this behaviour by setting the pref full-screen-api.exit-on-deactivate to false.

Comment 3

[Constantine]

Thank you for very useful information. With full-screen-api.exit-on-deactivate=false it works exactly as I want.