Jens Oliver Meiert

Use my latest work: latest tech book · latest non-tech book · latest optimization tool · latest defense tool

“HTML 5” or “HTML5”?

Published on Sep 11, 2009 (updated Apr 22, 2024), filed under , . (Share this post, e.g., on Mastodon or on Bluesky.)

This and 133 other posts are also available as a well-behaved ebook: On Web Development.

It’s “HTML5,” not “HTML 5,” declares the most recent post on the WHATWG blog. A seemingly trivial matter, yet compare that to names of other HTML specifications: HTML 2.0, HTML 3.2, HTML 4.01, XHTML 1.0, XHTML 1.1, XHTML 2.0.

Calling HTML 5 “HTML5” is inconsistent and grammatically wrong. I don’t understand the decision. Personally, I’ll continue to reference this version of HTML as… HTML 5.

About Me

Jens Oliver Meiert, on March 2, 2026.

I’m Jens (long: Jens Oliver Meiert), and I’m an engineering lead, guerrilla philosopher, and indie publisher. I’ve worked as a technical lead and engineering manager at various companies, including Google; I’m an open-source developer and a contributor to web standards (like HTML, CSS, WCAG); and I write and review books for O’Reilly and Frontend Dogma.

I love trying things, not only in web development and engineering management, but also with respect to politics and philosophy. Here on meiert.com I talk about some of my experiences and perspectives. (Please share feedback—interpret charitably, keep it friendly, but do be critical.)