[heycam/webidl] Browsers do not consistently seem to check this? (#958)

```js
var x = Object.create(getComputedStyle(document.documentElement));
document.write('display: ' + x.display);
```
In Firefox `x.display` throws, but it does not in Chrome/Safari (it yields "block"). For a similar test with `Location` all browsers throw.

I thought that per 1.1.2.3.2 of https://heycam.github.io/webidl/#dfn-attribute-getter this throws, but perhaps I'm holding it wrong? Or maybe it's some magic with CSS2Properties that ends up violating IDL?

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