target;
var entries = [];
var observer;
var iframe = document.getElementById("iframe");

iframe.onload = function() {
  runTestCycle(function() {
    target = iframe.contentDocument.getElementById("target");
    assert_true(!!target, "Target element exists.");
    observer = new IntersectionObserver(function(changes) {
      entries = entries.concat(changes);
    });
    observer.observe(target);
    entries = entries.concat(observer.takeRecords());
    assert_equals(entries.length, 0, "No initial notificat