When you develop html5 components or styles for MDriven Turnkey using the Turnkey core prototyper you can make a simple change so that it reloads on every discovered source change (css or javascript).

Simply paste in this script in the /Views/Shared/_Layout.cshtml:

<script type="text/javascript" src="http://livejs.com/live.js"></script>

This will do HEAD requests to ask the server for changes all the time - but only reload the page when a change is reported.

It is not a good idea to have this on the server - but it is super great to have while you develop.