[cssVariableReferenceValue.html]
  [CSSVariableReferenceValue can be constructed with no fallback]
    expected: FAIL

  [CSSVariableReferenceValue can be constructed with fallback]
    expected: FAIL

  [CSSVariableReferenceValue.variable can updated to a valid variable name]
    expected: FAIL

  [CSSVariableReferenceValue can be constructed with null fallback]
    expected: FAIL

  [CSSVariableReferenceValue can be constructed with valid fallback]
    expected: FAIL

