Differency normal characters and half characters on keydown

Question

We forked experimental Mediawiki VisualEditor. This WYSIWYM editor work with a hidden textarea and a representation of the content in DOM. When you focus the view, the focus

Answer 1

Just found a workaround. By listening to keyup event, dead keys returns a keyIdentifier property set to Unidentified.

So :

keyuphandler = function(e)
{
    if (e.keyIdentifier === 'Unidentified')
    {
        return;
    }
    doSomething();
}