[read-pixels-pack-parameters.html]
  bug: https://github.com/servo/servo/issues/26004
  [WebGL test #241]
    expected:
      if os == "mac": FAIL

  [WebGL test #242]
    expected:
      if os == "mac": FAIL

  [WebGL test #243]
    expected:
      if os == "mac": FAIL

  [WebGL test #244]
    expected:
      if os == "mac": FAIL

  [WebGL test #245]
    expected:
      if os == "mac": FAIL

  [WebGL test #246]
    expected:
      if os == "mac": FAIL

  [WebGL test #247]
    expected:
      if os == "mac": FAIL

  [WebGL test #254]
    expected:
      if os == "mac": FAIL

  [WebGL test #255]
    expected:
      if os == "mac": FAIL

  [WebGL test #256]
    expected:
      if os == "mac": FAIL

  [WebGL test #257]
    expected:
      if os == "mac": FAIL

  [WebGL test #258]
    expected:
      if os == "mac": FAIL

  [WebGL test #259]
    expected:
      if os == "mac": FAIL

  [WebGL test #260]
    expected:
      if os == "mac": FAIL