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First functional tests for `scrollbar-gutter` #24554

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felipeerias commented Jul 10, 2020

Tests for the values auto, stable and always of the scrollbar-gutter property, 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-width and ::-webkit-scrollbar to ensure that the scrollbars are of the "classic" kind. Testing scrollbar-gutter with overlay scrollbars will probably require browser-specific tests, since there isn't a cross-platform way to ensure the presence of overlay scrollbars.

@wpt-pr-bot wpt-pr-bot requested review from dbaron, frivoal and rachelandrew Jul 10, 2020
@felipeerias felipeerias force-pushed the felipeerias:first_tests branch from 0c74b40 to 2bea078 Jul 20, 2020
Tests for the values "auto", "stable" and "always" of the
scrollbar-gutter property with custom classic scrollbars.

Spec:
https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property
@felipeerias felipeerias force-pushed the felipeerias:first_tests branch from 2bea078 to cbac25e Jul 20, 2020
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