[whatwg/dom] form.disabled to disable the form submission (#646)

```html
<form id="form">
  <input name="foo">
  <input name="submit" type="submit">
</form>
```

Currently, it's possible to do `form.submit = true` to disable this form submission (either by clicking the submit button, or pressing enter in a field)

I'd like to propose that `form.disabled = true` behaves similarly, currently it does nothing to prevent submission


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