<!DOCTYPE html>
<html>
<body>
<script src="../resources/js-test.js"></script>
<div id="testDiv">test</div>
<script>
  description("Tests that an observation is received after disconnecting a visible target");
  jsTestIsAsync = true;

  let receivedInitialObservation = false;
  onload = () => {
    let intersectionObserver = new IntersectionObserver((_observations) => {
      gc();
      observations = _observations;

      shouldBe("observations.length", "1");
      shouldBeEqualToString("observations[0].target.tagName", "DIV");
      shouldBe("observations[0].target.foo", "1");

      if (!receivedInitialObservation) {
          receivedInitialObservation = true;
          shouldBeTrue("observations[0].isIntersecting");
          setTimeout(() => {
              debug("* Removing target from document");
              document.getElementById("testDiv").remove();
              gc();
              setTimeout(gc, 0);
          }, 0);
      } else {
          shouldBeFalse("observations[0].isIntersecting");
          setTimeout(finishJSTest, 100);
      }
    });
    let div = document.getElementById("testDiv");
    div.foo = 1;
    intersectionObserver.observe(div);
    div = null;
    gc();
    setTimeout(gc, 0);
  };
</script>
</body>
</html>