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Test Info:

<html>
<head>
<style id="id_3">
* {
position: absolute !important
</style>
<script>
function start() {
window.CustomElement0 = class extends HTMLElement {
constructor() {
super();
this.attachShadow({
mode: 'open'
})
}
}
customElements.define('custom-element-0', CustomElement0)
o1 = document.createElement('input')
o2 = document.createElement('custom-element-0')
document.documentElement.appendChild(o2)
o2.shadowRoot.prepend('', undefined, o1, '', undefined, document.getElementById('id_3'))
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>