HTML structure 100% still matters for accessibility. ... It just takes one person to accidentally paste code into the wrong place in Google Tag Manager to break your whole site.

Most top-ranking websites fail HTML validation. Google explains why perfect code isn’t required, and what matters instead.

Gary Illyes from Google said that the HTML structure for your web pages does not matter much for rankings. He said this on the latest Search Off The Record podcast, saying, "I know that some ...

H1 – H6 elements “briefly describe the topic of the section they introduce“.They form a page HTML semantic structure that can “be used by user agents, for example, to construct a table of ...