Automate text with AppleScript in Sencha Fiddle. Must have fiddle open and active tab, could do but meh

keystrokefu.scpt

on theSplit(theString, theDelimiter)
	-- save delimiters to restore old settings
	set oldDelimiters to AppleScript's text item delimiters
	-- set delimiters to delimiter to be used
	set AppleScript's text item delimiters to theDelimiter
	-- create the array
	set theArray to every text item of theString
	-- restore the old setting
	set AppleScript's text item delimiters to oldDelimiters
	-- return the result
	return theArray
end theSplit

activate application "Google Chrome"
tell application "Google Chrome" to tell active tab of window 1
	execute javascript "document.getElementsByTagName('textarea')[0].focus()"
end tell

delay 1

set toType to my theSplit("Ext.Msg.alert('', 'Mitch Rocks!')", "")

tell application "System Events"
	keystroke "a" using command down
	delay 0.5
	keystroke (ASCII character 8)
	delay 1
	
	repeat with characterType in toType
		keystroke characterType
		delay 0.1
	end repeat
	
	keystroke return using command down
end tell