Re: [csswg-drafts] [resize-observer] Which box information should we pass to the callback (#3329)

My feedback on the call was something like:
```js
ro.observe(elem, {box: ['content-box', 'border-box']});
ro.observe(elem2, {box: 'content-box'});

function callback(entry) {
  // elem2
  entry.borderBoxSize === null; // This entry null'd out as not explicitly observed.
}
```

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Received on Wednesday, 23 January 2019 17:42:47 UTC