Microsoft couldn’t leave good enough alone, so they had to build in a compatability mode to work with most of the rest of the world.

A new UI button located in the navigation bar just to the right of the address bar (next to the refresh button) controls the Compatibility Mode feature .

IE only displays this button when toggling into Compatibility View makes sense, such as when viewing Standards mode pages. In all other cases, such as when viewing Quirks mode pages or viewing intranet sites (they’re already being displayed in Compatibility View as discussed later in this post), IE hides the button.

Depending on the speed of your machine, you may see the page refresh when the Compatibility View button is selected. In any case, a balloon tip lets you know that the site is now running in Compatibility View. Additionally, the Compatibility View icon shows a “pressed” state so that you can know what view you’re running in after the balloon tip disappears.