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<!DOCTYPE html>
<style>
  #animate_0[onrepeat=''] {}
</style>
<animate id="animate_0" />
<animate id="animate_1" />
<script>
  window.CustomElement0 = class extends HTMLElement {
    constructor() {
      super();
      this.attachShadow({
        mode: 'open'
      })
    }
    connectedCallback() {
      this.shadowRoot.prepend(o2)
      this.setAttribute('contenteditable', 'true')
    }
  }

  customElements.define('custom-element-0', CustomElement0)
  o1 = document.createElement('custom-element-0')
  o2 = document.getElementById('animate_0')
  o3 = document.getElementById('animate_1')
  document.documentElement.appendChild(o1)
  document.replaceChild(document.documentElement, document.documentElement)
  o1.shadowRoot.prepend(o3)
  o3.offsetTop;
</script>