Compatibility issues HTML HTML5

Making IE6+ browser render as other browser engines

In quirks mode, it acts like IE 5.

Implements most of CSS 2.1 goodness.

To turn off compatibility mode and revert it back to IE 7 behavior, put the following tag in the head:

<meta http-equiv=”X-UA-Compatible” content=”IE=edge” />

Now, if you want a really good HTML5 ready engine to run on your old IE browsers, put the following tag:

<meta http-equiv="X-UA-Compatible" content="chrome=1" />
That will render pages as in chrome, even as you hit them with IE.