Low perfect solution IE version is not compatible with the semantic label scheme

It was added in the head tag, such as tag address the situation semantic nav, header or the like can not be recognized by IE.

<!--[if lte IE 8]>
    <script type="text/javascript" src="https://cdn.bootcss.com/html5shiv/r29/html5.min.js"></script>
<![endif]-->

Ie there is only a browser (IE8 less) identification, thus avoiding the high version of the browser (e.g. Google browser) is loaded superfluous.