Comment 2 for bug 1842148

? is the usual for web sites / web apps that I have experience with.

I wouldn't think to try Control+H.

If Control+H is supported for the reason Josh mentions, It would be nice if ? also worked.

One reason against supporting Control+H is that some browsers already use Control+H for History.

(On macOS, Command instead of Control is common, but there Command+H is an OS/window manager level shortcut for "Hide (current application)". There's probably a whole other bug here for addressing our current alt-based keyboard shortcuts on macOS.)

Regardless of what keyboard shortcut summons a display of available keyboard shortcuts, it may be useful to ALSO support summoning it via a menu option / button.

There are probably a few tangents here. Submitting this comment before I veer into a bikeshed. :-)