File: child-display-none.tentative.html

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firefox-esr 68.10.0esr-1~deb9u1
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Child frame marked as frozen</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async_test((t) => {

  var child = document.createElement('iframe');

  var loaded = false;
  var frozen = false;

  window.addEventListener('message', t.step_func((e) => {
    if (e.data == "load") {
      loaded = true;
    } else if (e.data == "freeze") {
      assert_true(loaded);
      frozen = true;
      child.style = "display: block";
    } else if (e.data == "resume") {
      assert_true(loaded);
      assert_true(frozen);
      t.done();
    }
  }));

  child.src = "resources/subframe.html";
  document.body.appendChild(child);
  child.style = "display: none";
}, "Child frame frozen");

</script>
</body>