New Post: "_spUserId is undefined" error when including the ALPHA

I am catching "_spUserId is undefined" when including the ALPHA in an HTML page in document library and loading HTML page in browser.

<script type="text/javascript" src="jquery.SPServices-2013.01ALPHA2.js"></script>

I assume this is because running from an HTML page in a doc lib is unsupported? Is there a plan to support this scenario? It is much simpler to deploy app to document library than to a customized aspx form. Thanks.