prefs: [layout.css.grid-template-masonry-value.enabled:true]
[align-tracks-valid.html]
  [e.style['align-tracks'\] = "normal, normal" should set the property value]
    expected: FAIL

  [e.style['align-tracks'\] = "start, flex-end, flex-end, flex-end, flex-end" should set the property value]
    expected: FAIL