[cssVariableReferenceValue-variable.html]
  [CSSVariableReferenceValue.variable can updated to a valid custom property name]
    expected: FAIL

  [Updating CSSVariableReferenceValue.variable to the empty string throws TypeError]
    expected: FAIL

  [Updating CSSVariableReferenceValue.variable to an invalid custom property name throws TypeError]
    expected: FAIL