Re: [clipboard-apis] Wording around default actions needs updating (#14)

I guess that canceling the before* events is supposed to prevent the copy/paste/cut? If so I'm thinking that some specs says the equivalent of:
```JavaScript
  var event = new ClipboardEvent('beforecopy');
  // event.isTrusted is true
  if (target.dispatchEvent(event)) {
    platformLevelCopy();
  }
```

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https://github.com/w3c/clipboard-apis/issues/14#issuecomment-125599710