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<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
<head>
<script>
customElements.define("custom-element", class extends HTMLElement {
  constructor() {
    super();
    const template = document.getElementById("template");
    const shadowRoot = this.attachShadow({mode: "open"})
      .appendChild(template.content.cloneNode(true));
  }
});

function boom()
{
  document.body.offsetHeight;

  var lastdiv = document.getElementById("last");
  var parent = lastdiv.parentNode;

  var newelt = document.createElement("span");
  newelt.setAttribute("slot", "foo");
  newelt.appendChild(document.createTextNode(1));
  parent.insertBefore(newelt, lastdiv);

  newelt = document.createElement("div");
  newelt.appendChild(document.createTextNode(4));
  parent.insertBefore(newelt, lastdiv);

  newelt = document.createElement("span");
  newelt.setAttribute("slot", "foo");
  newelt.appendChild(document.createTextNode(2));
  parent.insertBefore(newelt, lastdiv);

  document.body.offsetHeight;
  document.documentElement.className = "";
}
</script>

</head>
<body onload="boom();">
<template id="template">
  <div>
    <slot name="foo"/>
  </div>
  <div>
    <slot/>
  </div>
</template>
<custom-element style="display: block;">
  <div>3</div><div id="last">5</div>
</custom-element>
</body>
</html>