Summary: "beforeinput" event is useful for web apps which manage input
data into `<input>`, `<textarea>` and/or `contenteditable`. This event
is fired before our editor modifies value or DOM tree and some types are
cancelable. Therefore, if some user inputs are not acceptable for the
web app, they can cancel it, and/or modifies the value or the DOM tree
as they want.
Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=970802
Standard: https://w3c.github.io/uievents/#event-type-beforeinput
Platform coverage: all
Preference: dom.input_events.beforeinput.enabled (false by default for now)
DevTools bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1607686
--
Masayuki Nakano <masay...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko
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