[throwanem]

The relevant section of the standard: https://www.w3.org/TR/html5/sections.html#the-h1,-h2,-h3,-h4... - https://www.w3.org/TR/html5/sections.html#headings-and-secti... expands on this somewhat further.

For a considerably more detailed treatment with special attention to concerns around accessibility and some information on other document elements with similar significance, take a look at http://accessiblehtmlheadings.com/ .

[rocky1138]

I see. For the longest time I've been using <h2> as a sub-title. I guess I'll have to stop that. Thanks!

[throwanem]

You are most welcome!