One thing missing from the article: If you have a fullscreen mode, provide an alternative to the escape key for opening menus or whatever action you had bound t

One thing missing from the article: If you have a fullscreen mode, provide an alternative to the escape key for opening menus or whatever action you had bound to that key, because the browser interprets escape as a command to exit fullscreen mode. Plenty of the Humble Bundle asmjs games didn't get this.