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<!DOCTYPE html>
<html>
  <head>
    <script src="386310-script.js"></script>
    <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));
        }
      });
    </script>
  </head>
  <body>
    <template id="template">
      <span></span>
      <slot></slot>
    </template>
    <custom-element id="test" style="display: block;">first second third [fourth]</custom-element>
  </body>
</html>