[preferences-contrast.tentative.https.html]
  expected: ERROR
  [navigator.preferences.contrast supported]
    expected: FAIL

  [navigator.preferences.contrast.override supported]
    expected: FAIL

  [navigator.preferences.contrast.value supported]
    expected: FAIL

  [navigator.preferences.contrast.validValues supported]
    expected: FAIL

  [navigator.preferences.contrast.requestOverride() with invalid value throws]
    expected: NOTRUN

  [navigator.preferences.contrast.requestOverride('custom') throws]
    expected: NOTRUN

  [navigator.preferences.contrast.clearOverride() works]
    expected: NOTRUN

  [navigator.preferences.contrast.requestOverride(null) works like clearOverride()]
    expected: NOTRUN

  [navigator.preferences.contrast.requestOverride('') works like clearOverride()]
    expected: NOTRUN

  [navigator.preferences.contrast.requestOverride() updates (prefers-contrast)]
    expected: NOTRUN

  [navigator.preferences.contrast fires change event when requesting override]
    expected: FAIL

  [navigator.preferences.contrast fires change event when requesting override (without value change)]
    expected: NOTRUN

  [navigator.preferences.contrast fires change event when clearing override]
    expected: NOTRUN

  [navigator.preferences.contrast fires change event when clearing override (without value change)]
    expected: NOTRUN