Prevent key presses from propagating to Ableton Live?

Travis Cline's icon

I'm putting a textarea into a jweb -- how can I prevent key presses (s to single the current track, for example) from propagating to Ableton Live while in an input/textarea?

Source Audio's icon

Focus to keystrokes should be auto conrolled by host,
in this case Live.

Is your "textarea" not reporting when being targeted ?

Travis Cline's icon

I get key presses but they also are being interpreted by Live, additionally shortcuts like cmd-c/cmd-v do not work.