[background-valid.html]
  [e.style['background'\] = "url(\\"https://example.com/\\") 1px 2px / 3px 4px space round local padding-box content-box, rgb(5, 6, 7) url(\\"https://example.com/\\") 1px 2px / 3px 4px space round local padding-box content-box" should set the property value]
    expected: FAIL