A test for this behavior (which we fail some subtests) is here: https://wpt.fyi/results/css/css-overflow/scrollable-overflow-padding.html This test will eventually live in our tree as well as a WPT test, though it doesn't look like we've merged it over yet. But when we do, it will be at https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/css-overflow/scrollable-overflow-padding.html
Bug 1768921 Comment 1 Edit History
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A test for this behavior (in which we fail some subtests) is here: https://wpt.fyi/results/css/css-overflow/scrollable-overflow-padding.html This test will eventually live in our tree as well as a WPT test, though it doesn't look like we've merged it over yet. But when we do, it will be at https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/css-overflow/scrollable-overflow-padding.html