File: 1059138-1.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Testcase for bug 1059138</title>
<template>
  <div class="inner" style="border: 1px solid black; display:flex; width: 500px;">
    <button class="action-button">
      ThisIsAButton
    </button>
    <slot></slot>
  </div>
</template>

<script>
  // Gets content from <template>
  var template = document.querySelector('template').content;

  // Creates an object based in the HTML Element prototype
  class MyElement extends HTMLElement {
    // Fires when an instance of the element is connected
    connectedCallback() {
      // Creates the shadow root
      var shadowRoot = this.attachShadow({ mode: "open" });

      // Adds a template clone into shadow root
      var clone = document.importNode(template, true);
      shadowRoot.appendChild(clone);
    }
  };
  // Registers <my-elem> in the main document
  customElements.define('my-elem', MyElement);
</script>
</head>
<body>
  <my-elem><div>ThisIsADivFlexItem</div></my-elem>
</body>
</html>