Re: [whatwg/dom] May return the same HTMLCollection object (#706)

This doesn't expose GC as long as the browser holds a _strong_ reference to the returned collections, which might make sense for live collections since they are pretty lightweight (consisting of basically a tag name + JS object overhead). I'm not sure whether existing implementations use strong or weak references.

I think changing this should have a larger discussion, if that's desired. So /cc @bzbarsky @tkent-google @dstorey.

(Aside: it's funny to think that we could have had a weak reference polyfill for many years, at least in some browsers, just by storing expandos on collections returned by these methods...)

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