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I’m writing a user script for a complex web app. The existing code is catching the ‘j’ and ‘k’ keydown events.
I’d like to be able to find this function to see what it’s doing. Is there a way to list all the key event handlers in a document? Or maybe a way to set a breakpoint somehow in Chrome Developer Tools for when I press the letter?
Yes, in the developer tools, go to the Scripts tab, select the page, go to Event Listener Breakpoints, Keyboard, keydown.
Though this might not necessarily help you much, e.g. if the script is minified or they use a library. But you can give it a try.