coordsAtPos doesn't match text rendering position on Safari

[cyanzhong]

Describe the issue

I initially discovered this issue when I was exploring codemirror-vim on Safari: replit/codemirror-vim#118, I also started a thread on the forum.

Meanwhile, I spent some time investigating how coordsAtPos is implemented and seems it uses getClientRects, which makes me pessimistic about fixing this issue.

Browser and platform

Safari on Mac.

[marijnh]

Do you have a minimal reproduction script for this?

[cyanzhong]

Thank you for the quick response.

To reproduce the block cursor issue, I used the playground provided by replit: https://replit.com/@util/codemirror-vim, source code: https://github.com/replit/codemirror-vim/tree/master/dev.

To reproduce the selection position difference I showed in the forum, I used codemirror demos: https://codemirror.net/try/.

Just open using both Chrome and Safari and I was able to see the difference, I am on macOS Ventura.

[marijnh]

I am not seeing this, even when zoomed all the way in.

[cyanzhong]

That's weird.. I tried and reproduced using both Monterey and Ventura.

[hronro]

I confirm that I am experiencing the same issue on an M1 Mac mini running Monterey 12.6.5 and Safari Version 16.5.