[at-fallback-position-parse.html]
  expected:
    if (os == "android") and fission: [OK, TIMEOUT]
  [@position-fallback --foo {\n} should be a valid rule]
    expected: FAIL

  [@position-fallback --foo {\n  @try { }\n} should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { top: 1px; } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { --bar: 1px; } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { @keyframes bar {} } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { @font-face {} } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { arbitrary garbage } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { @try { @keyframes bar { } } } should be a valid rule]
    expected: FAIL

  [@position-fallback --foo { @try { @font-face { } } } should be a valid rule]
    expected: FAIL