components/test/data/optimization_guide/open_popup_iframe.html

<!DOCTYPE html>
<script>
  function getQueryParam(name) {
    const urlParams = new URLSearchParams(window.location.search);
    const value = urlParams.get(name);
    if (value == null)
      return '';
    return value;
  }

  window.onload = function() {
    const iframe = document.getElementById('frame1');
    iframe.src = getQueryParam('domain') + 'open_popup.html';
  };
</script>
<style>
  body {
    margin: 0;
  }
  iframe {
    border: unset;
    position: relative;
    top: 100px;
    left: 100px;
    width: 200px;
    height: 300px;
  }
</style>
<body>
  <iframe src="" id="frame1"></iframe>
</body>