tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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same-origin-grand-child-iframe.html (592B)

      1 <!DOCTYPE html>
      2 <!--
      3  target should be fully vertically in-viewport as 100px is way less than the
      4  default iframe height.
      5 
      6  right: 0 makes sure that we're occluded by 8px by the intermediate iframe.
      7 -->
      8 <div id="target" style="width: 100px; height: 100px; position: absolute; right: 0"></div>
      9 <script>
     10 const observer = new IntersectionObserver(records => {
     11  if (records[0].isIntersecting) {
     12    let { rootBounds, intersectionRect } = records[0];
     13    window.top.postMessage({ rootBounds, intersectionRect }, "*");
     14  }
     15 }, {});
     16 observer.observe(document.getElementById("target"));
     17 </script>