James Knott composed on 2020-07-04 12:41 (UTC-0400):
I've noticed some sites now require HTML5, which Firefox apparently doesn't support, at least not the version in Leap 15.2.
HTML5 "support" is a matter of degree. HTML5 has been around since before the birth of openSUSE. It's in a state of continuous change.
https://html.spec.whatwg.org/#is-this-html5? https://html.spec.whatwg.org/multipage/introduction.html#is-this-html5? https://html5test.com/ https://en.wikipedia.org/wiki/HTML5test