Works fine on my iPhone 14.

Similar problems on my MBP, actually – just sans crashed tab. Zooming in and scrolling around on Chrome and Safari cause the divs to rerender (repaint?) and often not all of them even do! E.g. Chrome: https://imgur.com/a/VWCAL9G

Scrolling is fine in Firefox but extremely slow.

It surprisingly smooth on Firefox on my Pixel 8

Interesting. Worked fine on my MBP in Safari. Even browsed around in the dev tools to see the styles used