-e: when the player loads in the background and you come back to the site it won't register input albeit being active again
-tested & reproduced on Win7 with chrome and FF

-repro
--open focusTest scene
--have several tabs open in your default browser
--build and run it
--as soon as the new tab is added switch to one of the other tabs and wait for it to finish loading in the background
--switch back to the unity tab without clicking into the player
--notice the counter going up
--press any key on your keyboard or controller
--NOTICE it won't register
--click into the player
--keys and button will now be registered