Some of you might remember when a 3mb flash animation could pack in some 5 minutes of animation, with the more advanced ones even having chapter/scene selectors, which could also include clickable easter eggs and other kinds of interactions during the scenes.
Again: HTML5 was supported way, way before flash disappeared.
https://caniuse.com/?search=canvas
That’s way before flash was discontinued. Except of on iOS, but smartphones were never the main platform for flash games/animation.
Flash-style skeletal animation was a result of technical limitations, not a deliberate art choice. The thing that killed flash-style animation was (a) the availability of better things like full-motion rasterized video and (b) the internet moving away from personal websites and towards big platforms, and almost all big platforms restricted the kind of content you can post to text, images and video.