twbs/bootstrap — pull request #10684 by buznardo (2013-09-17 16:25:48+00:00)
Title: Decouple small tag styling from HTML

Visual CSS should never be applied directly to HTML elements. All styling should be applied with class names.

Wrapping content in small tags does not always mean you want to change the appearance of that content. Small tags are for ranking the importance/relevance of content, not for styling content. That's what class names are for.