Sidebar resizer is disabled in Safari

[flachware]

This is the behavior of the official pdf.js. I guess that dates back to a time when Safari did not support CSS variables – I think we should open an issue for that in the pdf.js repository.

[mrtcode]

It seems there isn't anything specific mentioned about Safari, and something is still missing in Safari to pass the test.

[flachware]

Yes, but I suspect this is not because Safari isn’t capable of a resizable sidebar but rather because of the way the test is written. So just in case we need that functionality in Safari at some point, I suggest to try to fix it in the official pdf.js repo instead of patching it.