The conditional stylesheets in html.tpl.php are out dated. http://paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-ne... includes a newer, shorter version:

<!--[if lt IE 7]> <html class="lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>    <html class="lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>    <html class="lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html class=""> <!--<![endif]-->

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Issue summary: View changes
Status: Active » Closed (duplicate)

This has been updated here and committed: #1674260: Adapt html.tpl.php output to RDFa 1.1 / HTML5 (backport from Drupal 8)