[whatwg/dom] Can one get the "original" name of an element (#460)

given: 

```JS
const x = document.createElement("div");
x.innerHTML = "<TeSt>"
console.log(x.innerHTML); 
// "<test></test>"
```

For, `x.firstElementChild`, is it possible to get the, um, "original" name (i.e., "TeSt") that was used to create the element? 

Checking the spec, I'm guessing no - but wanted to double check in case I missed it. 

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