How about the keystrokes about cheerpj-meta

[alexp-sssup]

There is an optional cheerpjInit callback that let the user decides which additional shortcuts should be handled by Java rather than the browser: https://labs.leaningtech.com/cheerpj3/reference/cheerpjInit#overrideshortcuts

We do not automatically preventDefault all shortcuts since that would hijack legitimate ones that the user of the page might need. With the aforementioned callback the page author can refine the behavior.

[neoedmund]

after using

 await cheerpjInit({
         overrideShortcuts: function (e) {return true;}
        });

I cannot input a single character, something wrong?
I suppose to have as many keys as possible because it's a text editor app.

[alexp-sssup]

Simply returning true won't work. By returning true you are causing CheerpJ to preventDefault() all events. By calling preventDefault() on all keydown/keyup events there will be no keypress events.

This is how the browser work, not something that CheerpJ can change.

You need to carefully select the combination you are interested in.

[neoedmund]

still impressive job, thank you!