Although we use a lot of iframes in the test, the IE document mode is set by the parent document so we just need a single X-UA-Compatible in the main file.
http://msdn.microsoft.com/en-us/library/
cc288325(v=vs.85).aspx
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr" id="html">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+ <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<title>jQuery Test Suite</title>
<link rel="Stylesheet" media="screen" href="qunit/qunit/qunit.css" />
<link rel="Stylesheet" media="screen" href="data/testsuite.css" />