The WHATWG's philosophy for the HTML standard is never to sway too far from what browsers currently do, mainly to make sure that the browsers can keep up: https

The WHATWG's philosophy for the HTML standard is never to sway too far from what browsers currently do, mainly to make sure that the browsers can keep up: https://whatwg.org/faq?#living-standard https://whatwg.org/faq?#living-standard The browsers seem to like that, so it's probably unlikely that we'll get a wildly different HTML6 anytime soon, if ever.