Summary:
Two CSS properties scrollbar-{face,track}-color to style scrollbars in a color
by author.
These properties intends to provide a more restricted feature set for
controlling scrollbar styling than ::-webkit-scrollbar-* pseudo-elements
shipped in WebKit and Blink, so that authors can get native scrollbars while
still have some styling fitting their pages.
There is a consensus in the CSS working group that the existing pseudo-element
API is too powerful, and since scrollbar is an evolving technology, we want to
provide a restricted API to give users a native experience while allowing
authors to customize to some extent.
Hopefully with these properties (and one another controlling scrollbar width or
style to fulfill thin scrollbar usecases), WebKit and Blink would be able to
unship their current pseudo-elements, so that we wouldn't need to implement
them to get web compatible.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1460456
Link to standard:
https://drafts.csswg.org/css-scrollbars-1/#scrollbar-color-properties
Platform coverage: Desktop
Estimated or target release: maybe Firefox 63 or 64
Preference behind which this will be implemented:
"layout.css.scrollbar-colors.enabled"
Is this feature enabled by default in sandboxed iframes? Yes.
If not, is there a proposed sandbox flag to enable it? N/A
If allowed, does it preserve the current invariants in terms of what sandboxed
iframes can do? It's a rendering feature which sandboxed iframes can always be
simulated with existing rendering features.
DevTools bug: just some color properties, no need specific devtools support?
Do other browser engines implement this? Answer with: mixed signal. We would go
through the CSS working group and ensure other browser engines are happy with
them before shipping.
web-platform-tests: There are some web-platform-tests in
https://github.com/web-platform-tests/wpt/tree/master/css/css-scrollbars
The main rendering of this bug is not testable because scrollbars are very
platform-dependent, and rendering it like the platform natives is a large point
of the properties.
Secure contexts: It's not clear. Probably no because it is a rendering feature
which can always be simulated with existing features.
Also note that, DevTools has been using the properties for dark mode and gave
positive feedback of them on platforms which they have been available.
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