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Test Info:

<html>
<head>
<script>
function start() {
window.CustomElement0 = class extends HTMLElement {
constructor() {
super()
}
connectedCallback() {
this.before('', custom)
this.outerHTML = '<input pattern=""value=ð>'
}
}
customElements.define('custom-element-0', CustomElement0)
custom = document.createElementNS('http://www.w3.org/1999/xhtml', 'custom-element-0')
document.documentElement.appendChild(custom)
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>