File: ordering.html

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<!doctype html>
<title>ResizeObserver and IntersectionObserver ordering</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  async_test(function(t) {
    let sawResize = false;
    let sawIo = false;
    let resizeObserver = new ResizeObserver(t.step_func(function() {
      assert_false(sawIo, "ResizeObserver notification should be delivered before IntersectionObserver notification");
      sawResize = true;
      resizeObserver.disconnect();
    }));

    let io = new IntersectionObserver(t.step_func_done(function() {
      assert_true(sawResize, "IntersectionObserver notification should be delivered after ResizeObserver notification");
      sawIo = true;
      io.disconnect();
    }));

    resizeObserver.observe(document.documentElement);
    io.observe(document.documentElement);
  });
</script>