[css-overflow-4] subgrid obviates the need for scrollbar-gutter: force

[frivoal]

scrollbar-gutter: force was proposed to reserve the same amount of space in a non scrolling element as the gutter would in an adjacent scrolling element, for the purpose of lining things up visually. See example 15 in the spec. However, this value has been controversial, for a variety of reasons, some listed in the spec, such as issue 45 or issue 46.

I think subgrid solves the same problem, in a much more robust manner, and we can therefore drop the proposal for scrollbar-gutter: force.
Here's a little bit of sample code demonstrating it:
http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=12282

Overlay scrollbars	Classic scrollbars	Classic scrollbars with overflow:auto and no overflow

Everything aligns just as you'd want, regardless of overlay vs classic, overflow or not, scrollbar gutter or not…

So, since the use case that scrollbar-gutter: force was meant for looks solved, I propose we drop it.

[css-meeting-bot]

The CSS Working Group just discussed [css-overflow-4] subgrid obviates the need for `scrollbar-gutter: force` , and agreed to the following:

• RESOLVED: Drop scrollbar-gutter: force

The full IRC log of that discussion

<Frances> Florian: scrollbar-gutter: force value would be the same gutter in an element that doesn't scroll at all. A scroller and right next to the scroller a toolbar of some kind. If you have a scrollbar or a gutter that consumes space to the right, the same amount of space could visually line things up.
<astearns> +1 to removing the value
<Frances> Florian: grid and sub grid are good at aligning things to take into account the width, we can drop this property.
<bkardell_> I support closing an issue / removing an ask (for the record)
<Frances> Rossen: Any objections?
<Frances> PROPOSAL: Drop scrollbar-gutter: force
<Frances> RESOLVED: Drop scrollbar-gutter: force