File: nested-insertion-point-1.html

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<!DOCTYPE HTML>
<html>
<head>
  <script>
    function tweak() {
      // div with style "border: 10px solid green"
      var outerShadow = document.createElement("div");
      outerShadow.style.border = "10px solid green";

      var outerInsertionPoint = document.createElement("slot");
      outerShadow.appendChild(outerInsertionPoint);

      // div with style "border: 10px solid orange"
      var innerShadow = document.createElement("div");
      innerShadow.style.border = "10px solid orange";

      var slot = document.createElement("slot");
      innerShadow.appendChild(slot);

      outerShadow.attachShadow({mode: 'open'}).appendChild(innerShadow);

      var shadowRoot =
        document.getElementById('outer').attachShadow({mode: 'open'});
      shadowRoot.appendChild(outerShadow);
    }
  </script>
</head>
<body onload="tweak()">
<div id="outer">Hello</div>
</body>
</html>