For convenience, here's the test in question: https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/CSS2/backgrounds/background-root-020.xht reftest-analyzer shows what appears to be a correct snapshot of that test (green page, 2 light-green borders, and descriptive text). But for its reference snapshot, reftest-analyzer shows what seems to be this reference case: https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/CSS2/backgrounds/background-root-019-ref.xht ...which is not the reference case that background-root-020.xht actually calls for.
Bug 1553584 Comment 1 Edit History
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For convenience, here's the test in question: https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/CSS2/backgrounds/background-root-020.xht reftest-analyzer shows what appears to be a correct snapshot of that test (green page, 2 light-green borders, and descriptive text). But for the reference snapshot, reftest-analyzer shows what seems to be this unrelated reference case: https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/CSS2/backgrounds/background-root-019-ref.xht ...which is not the reference case that background-root-020.xht actually calls for.