[w3c/uievents] Suppress default browser key handling for keyboard event tester (#206)

The [keyboard event tester](http://w3c.github.io/uievents/tools/key-event-viewer.html) should have an option to call preventDefault() on keyboard events to prevent the browser from performing its default action. Without it, key combinations such as Shift+Ctrl+C are hard to examine because the browser swallows the keyup events for the modifiers.

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