Re: [whatwg/dom] Suggestion: new method - getNodesByType (#992)

> they do require extensive boilerplate

is that true though?

```js
function* getNodesByType(root, nodeType) {
    const iterator = document.createTreeWalker(root, nodeType);
    let node;
    while (node = iterator.nextNode())
      yield node;
}
```

You can use it like this:

```js
for (const node of getNodesByType(document, NodeFilter.SHOW_TEXT))
  console.log(node);
```

You can pass multiple filters too: `NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT`

The implementation in core will be pretty much the same of an iterator or a tree walker, so why is this method really needed?

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