By 2003, using the font size HTML attribute was not considered a ranking factor. In terms of ranking factors related to font size, only the heading element (H1, H2, etc.) was considered a ranking ...

The official HTML standards are flexible about the use ... but authors are strongly encouraged to either use only h1 elements, or to use elements of the appropriate rank for the section’s ...

Those that feel the H1 tag isn't used say; I doubt if the use of the H1 tag is still working to get get higher listings. I think it even may hurt your listings. I personally don't see it as H1's ...

In response to a question from a novice SEO about how many H1, header tags, should he use on a single page, John said on Twitter as many as he wants. Normally, a response from John would be ...

Instead, think about your users: if you have ways of making your content accessible to them, be it by using multiple H1 headings or other standard HTML constructs, then that’s not going to get ...