I think I found the cause.

one of the parent div have is properties perspective and it seem to be the problem… (Firefox 115*)

So I created an dirty workaround ;)

Thank you very much for your feedback @anzo@programming.dev & @rimu@piefed.social

Thanks @Max_P@lemmy.max-p.me weird because I can use XHR as async… see: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/open open(method, url, async)

Thank you all for your input’s !! 🤗

I’ve put the files on a USB flash drive formatted as a classic FAT. Then I mounted it in the VM (I confirm no need the VMware-tools for that :)