WebKit does not support this feature as specified.

Our opinion is that we don't want to encourage web developers to reserve space 
for scrollbars in a way that prevents non-interactive content from intruding 
into that space. This undoes a big advantage of overlay scrollbars, in that 
they leave more space for content.

Our preference would be some kind of margin value (perhaps a constant) that 
allows authors to move only interactive content outside of the area affected by 
overlay scrollbars.


> On Feb 23, 2021, at 5:54 AM, Felipe Erias via webkit-dev 
> <webkit-dev@lists.webkit.org> wrote:
> Hi webkit-dev,
> This is a request for WebKit's position on the CSS "scrollbar-gutter" 
> property. The spec status is Working Draft. This feature is already 
> implemented in Chrome behind a flag.
> Spec:
>  https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property
> Explainer:
>  https://github.com/felipeerias/scrollbar-gutter-explainer
> Existing WebKit bug:
>  https://bugs.webkit.org/show_bug.cgi?id=167335
> Summary:
> The scrollbar-gutter property provides control over the presence of scrollbar 
> gutters (the space which may be reserved to display a scrollbar).
> This gives Web authors more agency over how their layouts interact with the 
> scrollbars provided by the browser, so they can e.g. prevent excessive layout 
> changes as content expands while avoiding unwanted visuals when scrolling 
> isn't needed.
> Thanks!
> Best.
> Felipe
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