Applescript to pause and play youtube videos using Alfred (In Chrome)

README

First go to https://www.youtube.com/html5 and request the html5 player (click the button)
Then download Alfred from the app store (https://itunes.apple.com/us/app/alfred/id405843582?mt=12)
go to alfred preferences and make sure AppleScripts is checked in the results preferences 

next open a youtube video in chrome

then open alfred via the shortcut (ctrl+space or option+space) and type youtubeController (you can just start to type it and as soon as it shows up hit enter)

this is will pause or play the video for you and after you use alfred to run it a few times you should be able to open alfred and type yo and hit enter and it works.

We will be working on getting this to be bound to a keyboard shortcut and as soon as that is done we will update this with how to do that.

youtubeController

tell application "Google Chrome"
	set found_video to false
	set window_list to every window
	repeat with the_window in window_list
		if found_video is equal to true then
			exit repeat
		end if
		set tab_list to every tab in the_window
		repeat with the_tab in tab_list
			if the title of the_tab contains "- YouTube" then
				tell the_tab
					execute javascript "var h = document.querySelector('[aria-label=\"Pause\"]');"
					execute javascript "if(h == null) var h = document.querySelector('[aria-label=\"Play\"]');"
					execute javascript "h.click()"
				end tell
				set found_video to true
				exit repeat
			end if
		end repeat
	end repeat
end tell

You're awesome. I've been wanted this forever.

I've made this into a workflow, available at https://github.com/frederickfogerty/alfred-youtube. I've credited you in all the work @khrice.