Or based on my reading of your link, it is summarized at the end as:
Quote:
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It may help to think of b or i elements as essentially a span element with an automatic fallback styling. Just like a span element, these elements usually benefit from class names if they are to be useful.
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They are effectively using an attribute ("class" in this case) to confer a semantic meaning. The problem is the class name need not actually indicate anything and it might be better to had attributes with specific recognized vocabularies meant to capture semantic meaning instead of free form class names that may or may not be recognized.
KevinH