Known Test Divergences

Known Test Divergences

We deliberately do not change current CSS Color 4 behavior merely to match two pinned Rec.2020 green-reference fixtures. The tests are still executed and still counted as failures.

• rec2020-001.html: reference greensquare-ref.html.
• predefined-012.html: reference greensquare-090-ref.html.

Current CSS Color 4 specifies display-referred Rec.2020 gamma 2.4; OPBrowser implements that rule. These are recorded as known legacy-reference divergences, not as passing or excluded tests.

The remaining xyz-003.html failure is different: the upstream test expressly allows a one-byte pixel difference on up to 18,432 pixels. It passes only in the separately labeled WPT-metadata report.

Strict Static: 197/200. Optional source-authored fuzzy: 198/200. Both Rec.2020 cases remain failed in both measurements.

Full evidence, revision, review criteria and commands: KNOWN_TEST_DIVERGENCES.md.