Gloss relies on a technique called “Content Assignment”, this makes it possible for a designer to assign headers, footers, menus and other components to elements of a template, simply by assigning special classes to elements of their template.
The general day to day workflow roughly looks like this:
Start with an html layout, we’ll assume that you spent time on each pixel and css rule to handcraft the most beautiful, well-formed, and preferably responsive, layout.
To your html layout you then add special Gloss classes (specifically these are CSS classes prefixed with gl-).
Then you publish or upload your changes.
As much as possible, Gloss does the rest for you.