reinsert-element.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/reinsert-element.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

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

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

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

<style>

pre, #log {

  position: absolute;

  top: 0;

  left: 200px;

</style>

<div id="target">Hello, world!</div>

<script>

promise_test(async function(t) {

  let entries = [];

  let target = document.getElementById("target");

  let observer = new IntersectionObserver(function(changes) {

    entries = entries.concat(changes);

});

  observer.observe(target);

  await waitForNotification();

  assert_equals(entries.length, 1);

  assert_true(entries[0].isIntersecting);

  target.remove();

  document.body.appendChild(target);

  await waitForNotification();

  assert_equals(entries.length, 1);

  assert_true(entries[0].isIntersecting);

}, "An element that is removed and reinserted without an intervening" +

  " rendering update doesn't generate a 'not-intersecting' notification.");

</script>