First functional tests for scrollbar-gutter #24553
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Tests for the values "auto", "stable" and "always" of the scrollbar-gutter property with classic scrollbars. Spec: https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property
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Tests for the values
auto,stableandalwaysof thescrollbar-gutterproperty, using classic scrollbars.Spec: https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property
The basic test works by comparing the size of the container and contained elements, which should be the same unless a scrollbar gutter is being shown.
It uses
scrollbar-widthand::-webkit-scrollbarto ensure that the scrollbars are of the "classic" kind. Testingscrollbar-gutterwith overlay scrollbars will probably require browser-specific tests, since there isn't a cross-platform way to ensure the presence of overlay scrollbars.