What keyboard shortcut will open up full screen mode while playing YouTube videos?
Viewing on a Windows 7 machine.
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While not a simple shortcut, there are several ways to achieve fullscreen play without a mouse:
Visit https://youtube.com/html5 and opt-in to the experiment.
After that most (but not all) youtube videos will use the native
<video> tag instead of Flash, with a slightly different UI. The fullscreen control is reachable in this UI by pressing (quite a lot) Tab/Shift+Tab.
Edit the URL (Alt+D) from
https://youtube.com/watch?v=t9HMeYs2Yas form to
This will give you the player filling the whole browser window; you can now press F11 to really go full screen (being browser fullscreen, it behaves better than Flash fullscreen, especially with multiple monitors).
A major drawback is that you're trapped into that one video — no access to comments, related videos, search etc.
Edit the URL to
https://www.youtube.com/tv#/watch?v=t9HMeYs2Yas form (if you're signed in you can just visit https://youtube.com/tv, navigate Up to My Watch History and press Enter to open your last video).
This is by far the most keyboard-friendly way to consume youtube.
Unfortunately, there is no built-in keyboard shortcut for going full screen on Youtube.
This is the current list of shortcuts.
There seems to be some indication that pressing F should switch to full-screen mode, but http://www.makeuseof.com/tag/comprehensive-guide-youtube-player-keyboard-shortcuts/ states that it doesn't work for everyone. Didn't work for me, anyway.
You can check out these links and create your full screen YouTube launcher.