[flex-valid.html]
  [e.style['flex'\] = "calc(10 + (sign(20cqw - 10px) * 5)) calc(10 + (sign(20cqw - 10px) * 5)) 1px" should set the property value]
    expected: FAIL

  [e.style['flex'\] = "1 1 calc(10px + (sign(20cqw - 10px) * 5px))" should set the property value]
    expected: FAIL