Google's John Mueller advises using semantic HTML. Though not a ranking factor, it helps search engines understand content and boosts accessibility.

Semantic HTML5 provides us with an opportunity to improve our websites and optimize for search engines. ... For example, <header> is its own element now, as is <nav>, and so on.

BOSTON – The Semantic Web could be the key to unlocking scientific data that’s sequestered by disparate applications’ formats and organizational limitations, and could allow scientists to ...