ss</code> file contains doc comments and some tags (tokens starting with <code>@</code>).  These comments and tags define a structure:</p>
<ul>
<li><em>Categories</em> group similar concepts. The side nav of this site shows categories like typography or spacing.</li>
<li><em>Scales</em> or <em>Groups</em> are the different available values for the same CSS attribute.  These appear in the right-hand sidebar
on each category page.  Font scale is an example.</li>
<li><em>Property</em> is a custom property, as 