[add-background-attachment-fixed-during-smooth-scroll.html]
  expected:
    if (os == "linux") and debug: [PASS, FAIL, TIMEOUT]
    if (os == "android") and swgl: [PASS, FAIL, TIMEOUT]
    if os == "win": [PASS, FAIL, TIMEOUT]
  fuzzy: maxDifference=0-1;totalPixels=0-10