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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>