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[css-scrollbars] Scrollbar properties on the root element should be propagated to viewport #2696

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upsuper opened this Issue May 23, 2018 · 4 comments

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upsuper commented May 23, 2018

Scrollbar properties on the root element should be propagated to viewport, similar to what we do for overflow properties. Otherwise, there would be no way to style scrollbars of viewport.

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tantek commented May 23, 2018

Thanks <https://github.com/upsuper> and good call. Do you have any preferred wording for this, or shall I clone language from <https://drafts.csswg.org/css-overflow/#overflow-propagation> ?

(Originally published at: http://tantek.com/2018/143/t2/)

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upsuper commented May 23, 2018

I think we only need

UAs must apply the scrollbar-* values set on the root element to the viewport.

Sentences for overflow after that are basically for webcompat reason, which we shouldn't take. That's not something we want to spread.

Maybe we should add a note to mention that this is different from overflow that values on <body> wouldn't be propagated to viewport.

tantek added a commit that referenced this issue May 24, 2018

root scrollbar colors also set on viewport #2696
Per issue #2696, root scrollbar colors also set viewport scrollbar colors. Also add explicit intro paragraph about where spec source is because "Repository:" metadata block appears to do nothing (does not work to add a link to the GitHub repo).
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tantek commented May 24, 2018

<https://github.com/upsuper> your suggested text makes sense to me, and I have also added an explicit note so implementers hopefully don’t accidentally propagate body to viewport.

Please take a look at the prose after the property value table at <https://drafts.csswg.org/css-scrollbars-1/#scrollbar-color-properties> and if the updates are sufficient to resolve this issue, go ahead and close.

(Originally published at: http://tantek.com/2018/143/t5/)

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upsuper commented May 24, 2018

The spec currently only has scrollbar color properties so far, but I think this should probably apply to any future scrollbar properties as well (e.g. something controlling the width of scrollbar)? We may want to put it in an independent section or so, I guess...

But the current wording is enough for resolving this issue so I'm going to close it for now.

@upsuper upsuper closed this May 24, 2018

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