Figma is the gold standard when it comes to performance and optimization, and is basically a native app that happens to be inside your browser. The co-founder and previous CTO Evan Wallace also created esbuild which powers most of the modern bundling tools.
The only other web app I can think of doing the same thing is Google Docs, which uses it's own canvas based renderer with an svg overlay for accessibility. I feel it's telling that Google thought leaning on their own browser (through HTML/CSS) wasn't even good enough for typesetting.
This Evan Wallace fella sounds like an accomplished individual
It's becoming more common. Confluence whiteboards is all WebGL, even the text rendering.
Google Docs used to be Writely though; they acquired it. It predates Chrome.
the switch to canvas rendering is recent though
https://workspaceupdates.googleblog.com/2021/05/Google-Docs-...
Oh! I didn't know that. Fair enough - that does rather make the point.