Re: [heycam/webidl] Extending an interface with boolean attribute with default value false (#880)

`speechSynthesis.speak(new SpeechSynthesisUtterance('<p>hello<break>universe</p>', {ssmlMode: true})) // defined at SpeechSynthesisUtterance`

or 

`speechSynthesis.speak(new SpeechSynthesisUtterance('<p>hello<break>universe</p>'), {ssmlMode: true}) // defined at speak`

_not_ defined when trying to set after constructor?

```
const u = new SpeechSynthesisUtterance();
u.text =  '<p>hello<break>universe</p>';
u.ssmlMode = true;
```

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