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[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