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chromium/third_party/blink/web_tests/external/wpt/intersection-observer/not-in-containing-block-chain.html 

<!doctype html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://github.com/w3c/IntersectionObserver/issues/457">
<style>
  div {
    width: 100px;
    height: 100px;
    background: blue;
    margin: 10px
  }
</style>
<div id="target"></div>
<div id="root"></div>
<script>
let t = async_test("IntersectionObserver reports a (non-intersecting) entry even if not in the containing block chain");
new IntersectionObserver(
  t.step_func_done(function(records) {
    assert_equals(records.length, 1);
    assert_false(records[0].isIntersecting);
  }),
  { root: document.querySelector("#root") }
).observe(document.querySelector("#target"));
</script>