Talking about "small trick" that I learned from the article
(where he at number 10). The author proposes to highlight in the layout classes in some logically connected by context blocks. For example:
<div class="[ o-layout-item o-grid c-button"></div>
In his example, he allocated the block based on the fact that the classes with the prefix o-
are objects markup and classes are prefixed with c-
Perversion or fit practice (no)? In the internal browser view created hell things like .\[., which, of course, no css, but still.