same-origin-grand-child-iframe.sub.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /intersection-observer/same-origin-grand-child-iframe.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<meta name="viewport" content="width=device-width,initial-scale=1">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/get-host-info.sub.js"></script>

<script src="./resources/intersection-observer-test-utils.js"></script>

<iframe scrolling="no" frameborder="0" id="iframe"></iframe>

<script>

promise_test(async t => {

  iframe.src =

    get_host_info().HTTP_NOTSAMESITE_ORIGIN + "/intersection-observer/resources/cross-origin-child-iframe.sub.html";

  const { rootBounds, intersectionRect } = await new Promise(resolve => {

    window.addEventListener("message", event => resolve(event.data));

  }, { once: true } );

  // 300px = iframe viewport width

  // 8px = default body margin

  // (intersectionRect is in the coordinate space of the target iframe)

  assert_equals(intersectionRect.top, 8);

  assert_equals(intersectionRect.left, 200);

  assert_equals(intersectionRect.right, 300 - 8);

  assert_equals(intersectionRect.width, 100 - 8);

  assert_equals(intersectionRect.height, 100);

  assert_equals(rootBounds.left, 0);

  assert_equals(rootBounds.top, 0);

  assert_equals(rootBounds.right, document.documentElement.clientWidth);

  assert_equals(rootBounds.bottom, document.documentElement.clientHeight);

}, "rootBounds in a same-origin iframe in the case where there is a cross-origin "

+  "iframe in between the top document and the same origin iframe");

</script>