gulp-usemin-extend/test/fixtures/conditional-css.html

Replaces references to non-optimized scripts or stylesheets into a set of HTML files (or any templates/views).

<!-- build:css /style.css -->
<!--[if lt IE 9]>
<link rel="stylesheet" href="css/clear.css"/>
<link rel="stylesheet" href="css/main.css"/>
<![endif]-->
<!-- endbuild -->