[parse-is.html]
  [":is(#a)" should be a valid selector]
    expected: FAIL

  [".a.b ~ :is(.c.d ~ .e.f)" should be a valid selector]
    expected: FAIL

  [".a.b ~ .c.d:is(span.e + .f, .g.h > .i.j .k)" should be a valid selector]
    expected: FAIL

  [":is(:hover,:focus)" should be a valid selector]
    expected: FAIL

  ["a:is(:not(:hover))" should be a valid selector]
    expected: FAIL

  [":is(ul,ol,.list) > [hidden\]" should be a valid selector]
    expected: FAIL