wfray 0 Newbie Poster

I've recently upgraded to Windows 8.1 and IE 11. When testing my PHP/html/Javascript code, using Xampp, various display and processing errors occur. For example: a particular javascript function doesn't seem to even get get invoked; the javascript return function works differently; icons don't display correctly, etc. When I put the test site in compatibility mode(within IE 11), everything displays and works fine. Is there a good source of information about how to programmatically control compatibility mode or identify the browser quirks/changes and adjust the html/javascript to work correctly?