[is-where-basic.html]
  [:is() matches expected elements]
    expected: FAIL

  [:is(#a) matches expected elements]
    expected: FAIL

  [:is(#a, #f) matches expected elements]
    expected: FAIL

  [:is(#a, #c) :where(#a #d, #c #f) matches expected elements]
    expected: FAIL

  [#c > :is(#c > #f) matches expected elements]
    expected: FAIL

  [#c > :is(#b > #f) matches expected elements]
    expected: FAIL

  [#a div:is(#d) matches expected elements]
    expected: FAIL

  [:is(div) > div matches expected elements]
    expected: FAIL

  [:is(*) > div matches expected elements]
    expected: FAIL

  [:is(*) div matches expected elements]
    expected: FAIL

  [div > :where(#e, #f) matches expected elements]
    expected: FAIL

  [div > :where(*) matches expected elements]
    expected: FAIL

  [:is(*) > :where(*) matches expected elements]
    expected: FAIL

  [:is(#a + #b) + :is(#c) matches expected elements]
    expected: FAIL

  [:is(#a, #b) + div matches expected elements]
    expected: FAIL