For use on blog post: http://www.normansolutions.co.uk/post/to-cms-or-not-to-cms

cmsOrNotSection3.html

//cdn fallback for Bootstrap css
<div id="bootstrapCssTest" class="hide"></div> // (HTML in  _Layout.cshtml)
if ($('#bootstrapCssTest').is(':visible') === true) {
    $('<link href="\css/bootstrap.min.css" rel="stylesheet" type="text/css" />').appendTo('head');
} 

//cdn fallback for Bootstrap js
if (typeof ($.fn.modal) === 'undefined') {
    $('<script src="\scripts/bootstrap.min.js">\x3C/script>').appendTo('head');
} 

//cdn fallback for jQuery
<script>window.jQuery || document.write('<script src="\scripts/jQuery.min.js">\x3C/script>')</script>