This helped me. Put it in html.tpl.php before the <head>

<!-- Pulled from http://code.google.com/p/html5shiv/ -->
<!--[if lt IE 9]>
<script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->

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tsi’s picture

tsi commented
Title: Support html5 div-oriented elements in ie8 » Support html5 elements in ie8
Status: Active » Closed (works as designed)

This is already in, always was.
You can turn it on/off via theme settings.