[autoplay-hidden.optional.html]
  expected:
    if (os == "win") and swgl: TIMEOUT
    if (os == "win") and not swgl: [OK, TIMEOUT]
    if os == "mac": [OK, TIMEOUT]
  [Allow delaying autoplay until video elements become visible]
    expected:
      if (os == "win") and swgl: TIMEOUT
      if (os == "win") and not swgl: [PASS, TIMEOUT]
      if os == "mac": [PASS, TIMEOUT]