Re: [w3c/uievents] no way to distinguish printable key values from non-printable (#264)

> So far we are looking to decode the given key as a UTF-32 sequence, and test if it is a single UTF-32 glyph, and assume the key is printable if so, but it is unclear if that will be guaranteed.

More specifically, what we are looking at is the following:

```js
function isPrintableKeyEvent(event) {
  var codeUnit = event.key.charCodeAt(0);
  var isLeadSurrogate = (codeUnit >= 0xD800 && codeUnit <= 0xDFFF);
  return event.key.length == 1 || (event.key.length == 2 && isLeadSurrogate);
}
```

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