Let’s say you’re adding some newer CSS changes to your site and for some reason, they work fine in Chrome or Firefox, but not showing up like they should in IE10.

Have no worries. Most likely, there’s a compatibility view setting that is causing the problem. Under Tools, choose ‘Compatibility View Settings’. Check your list of website, and the checkboxes below the URL listbox and uncheck or remove whatever is needed.

For me, it was a matter of unchecking the ‘Display Intranet Sites in Compatibility View’ checkbox.