[webkit-dev] Request for position: CSS scrollbar-gutter

[Emilio Cobos Álvarez]

I guess that'd solve parts of the issue, but not the use-case of 
non-overlay scrollbars in overflow: auto causing reflow when the content 
initially overflows.

But it seems like a much simpler version of scrollbar-gutter (one that 
would only work with non-overlay scrollbars, and on scrollable boxes) 
could solve.

  -- Emilio

On 2/23/21 22:08, Emilio Cobos Álvarez via webkit-dev wrote:
> Just thinking out loud, but has an environment variable for scrollbar 
> widths (maybe two, one for thin scrollbars, one for regular-width 
> scrollbars) be enough to do the job here?
> 
> I recall similar proposals in the CSSWG, but I'm not sure if they were 
> discussed seriously. It seems it should be easier to implement, 
> off-hand, and maybe less confusing? And it would allow the pattern Simon 
> mentions here.
> 
> It should also allow solving some of the issues people hit with vh/vw if 
> non-overlay scrollbars are used[1]. I guess for that last use-case we'd 
> really need two pairs of values, one of which should return zero for 
> overlay scrollbars for that use-case to work...? Anyhow, seems like this 
> could be discussed in the CSSWG.
> 
> -- Emilio
> 
> [1]: https://github.com/w3c/csswg-drafts/issues/6026
> 
> On 2/23/21 18:45, Simon Fraser via webkit-dev wrote:
>> 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.
>>
>> Simon
>>
>>
>>> On Feb 23, 2021, at 5:54 AM, Felipe Erias via webkit-dev 
>>> <webkit-dev at 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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>>
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