[whatwg/dom] Inform event handler about the default action of an event (#382)

Sometimes authors may want to know the default action of an event if it is not prevented, for example, if it is a shortcut to save the page, the page may want to cancel it and do an internal save action, or if it is a ctrl/cmd-click which opens the link in a new tab, the page may want to do something different than a normal click.

Currently, authors need to detect the platform and even browser to correctly respond to events, for e.g. ctrl on PC vs. cmd on Mac. It might be worth a standard way to know the default action of an event.

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