[gl-vertex-attrib-zero-issues.html]
  bug: https://github.com/servo/servo/issues/26004
  [WebGL test #11]
    expected:
      if os == "mac": FAIL

  [WebGL test #13]
    expected:
      if os == "mac": FAIL

  [WebGL test #17]
    expected:
      if os == "mac": FAIL

  [WebGL test #19]
    expected:
      if os == "mac": FAIL

  [WebGL test #23]
    expected:
      if os == "mac": FAIL

  [WebGL test #25]
    expected:
      if os == "mac": FAIL

  [WebGL test #29]
    expected:
      if os == "mac": FAIL

  [WebGL test #31]
    expected:
      if os == "mac": FAIL

  [WebGL test #5]
    expected:
      if os == "mac": FAIL

  [WebGL test #7]
    expected:
      if os == "mac": FAIL