> Safari is lagging on HTML5 features for decade far behind Firefox.
Really?
Safari was first to ship :has() in March 2022; Firefox couldn't ship until December 2023.
I listed a bunch of web platform features Safari shipped before Chrome and Firefox [1][2].
Even now, Firefox hasn't shipped Anchor Positioning, Scroll-driven animation, text-wrap: pretty, Web GPU, Cross-document view transitions, etc. but Safari and Chrome have.
>but Safari and Chrome have
Not on iOS. On iOS, it's all Safari, all the time, for every web browser app. Apple forbids any web browser engine other than Safari on iOS.