HTML structure 100% still matters for accessibility. Accessibility is not a direct ranking factor, though, so it’s a bit outside the scope of this article.

Ann Smarty analyzes how much semantic HTML structure really matters. She poses questions related to page headings and multiple H1 tags on a page, before making a few educated "guesses" to answer ...

But it doesn't tell Google your page or site is quality by making sure to use good semantic HTML structure - anyone can do that. Forum discussion at Twitter.

The Semantic Web could be the key to unlocking scientific data that’s sequestered by disparate applications’ formats and organizational limitations, World Wide Web inventor Tim Berners-Lee ...

The Semantic Web “will give scientists and other users unexpected help and serendipitous added value from others’ data,” Berners-Lee, director of the World Wide Web Consortium (W3C), said at ...