tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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nested-cross-origin-grand-child-iframe.html (413B)

      1 <!DOCTYPE html>
      2 <div id="target" style="height: 100px; background-color: green;"></div>
      3 <script>
      4 const observer = new IntersectionObserver(records => {
      5  records.forEach(record => {
      6    if (record.isIntersecting) {
      7      window.top.postMessage(record.isIntersecting, "*");
      8    }
      9  });
     10 }, {});
     11 observer.observe(target);
     12 window.addEventListener("load", () => {
     13  window.top.postMessage("ready", "*");
     14 });
     15 </script>