Not ready to state that this is entirely incorrect, but it is at least inconsistent. Chrome and Firefox both send a space even when Alt is pressed. We at noVNC would like to avoid surprises like this for our users. :)
Option+Space is supposed to insert a non-breaking space on macOS. Seems like a bug in those other browser engines.
Alright, thanks. I've filed reports with them: https://bugzilla.mozilla.org/show_bug.cgi?id=1593633 https://bugs.chromium.org/p/chromium/issues/detail?id=1021006 (Chrome's issue tracker seems to be broken at the moment though, so no comments)