Re: [csswg-drafts] [selectors-4] Rescope :has to static CSS rather than .querySelector (#3925)

@SelenIT
The following is more performant:
```js
Array.from(document.querySelectorAll('a img', img => {
	let el = img;
	while ((el = el.parentElement)) {
		if (el.localName.toLowerCase() == 'a') return el;
	}
	return null;
});
```

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