Version: 55.0.2882.0
OS: macOS

What steps will reproduce the problem?
(1) Make a website show a notification (`var n = new Notification('foo')`)
(2) Add a click handler to the notification (`n.onclick = e => { console.log('clicked'); };`)
(3) Click the notification.

What is the expected output?
The click handler is called only when I release the mouse button, so that I have a chance to change my mind by moving the cursor away from the notification before releasing.

What do you see instead?
The click handler fires as soon as I press down the mouse button.