There I was, showing off the cool Web page prototype on my local machine. I copied it up to the network folder and pointed my coworkers at the shared location. The layout broke on Internet Explorer 8, but it tested fine for me locally. I copied the files to another local machine, and sure enough, it looked fine, locally.

Adding the following fixed the issue:
<meta http-equiv="X-UA-Compatible" content="IE=100" />

Here’s the detailed explanation:
MSDN Article