@webcomponents/webcomponentsjs/tests/imports/element-import.html

Web Components Polyfills

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<x-foo></x-foo>
<script>
(function() {
  class XFoo extends HTMLElement {
    connectedCallback() {
      this.isCreated = true;
    }
  }
  window.customElements.define('x-foo', XFoo);
})();
</script>