[cssom-view] Should `scrollParent` allow axis filtering?

[Loirooriol]

#12289 allows boxes to only be scrollable in one axis.

So I suspect authors may want to query the scroll container that is scrollable in a specific axis.

Maybe they can just do

let scrollParent = element.scrollParent;
while (scrollParent) {
  if (getComputedStyle(scrollParent).overflowY != "clip") {
    break;
  }
  scrollParent = scrollParent.scrollParent;
}

But should we instead allow something like element.scrollParent({axis: "y"})?

[tabatkins]

Well, we'd need to spell it differently (.scrollParent is already an element, it can't be a function), but it doesn't seem unreasonable.

[Loirooriol]

AFAIK no major browser has shipped it yet, so we can still make it a function if we want. The common case would just be element.scrollParent().

[tabatkins]

Ah, fair.