This is a special post for quick takes by Chris_Leong. Only they can create top-level comments. Comments here also appear on the Quick Takes page and All Posts page.
Collapsable boxes are amazing. You should consider using them in your posts.
They are a particularly nice way of providing a skippable aside. For example, filling in background information, answering an FAQ or including evidence to support an assertion.
Compared to footnotes, collapsable boxes are more prominent and are better suited to contain paragraphs or formatted text.