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

There is also [`NodeIterator`](https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator).
```
function* getNodesByType(root, nodeType) {
    const nodeIterator = document.createNodeIterator(root, NodeFilter.SHOW_ALL, (node) => node.nodeType == nodeType);
    if (nodeIterator.referenceNode && nodeIterator.referenceNode.nodeType == nodeType)
        yield nodeIterator.referenceNode;
    while (nodeIterator.nextNode())
        yield nodeIterator.referenceNode;
}
```

I don't think we want to invent yet another way of iterating over nodes of a particular criteria at this point unless it provides a significant improvement / value over existing methods.

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