I also think that not specifying the font size should not be called bad practice (unless you defined the font sizes for everything else and omitted some of them

I also think that not specifying the font size should not be called bad practice (unless you defined the font sizes for everything else and omitted some of them; if you do that then it is inconsistent). If you do not specify any CSS at all, that should not be a warning or error (it might not be displayed the same on all computers, but it shouldn't need to be anyways, so it is OK). > As a reader, I don't want page authors to start hard coding sizes into these elements I also, would rather they don't hard-code sizes (and also fonts, margins, etc); use whatever size is configured in the browser which is suitable for that display and that user. > Additionally, the current behaviour (which I'd never particularly considered before) sounds entirely reasonable - if I take some existing markup and blockquote it in some container, I'd expect the headings to shrink as they're now all sub-elements of some other section. Maybe. It is unclear that there should be a first-level heading inside of something else anyways.