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@webcomponents/custom-elements

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HTML Custom Elements Polyfill

webcomponents.org/polyfills

webcomponents/custom-elements

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<!DOCTYPE html> <script> 'use strict'; class NestedLevel3 extends HTMLElement { constructor() { super(); constructors.push({element: this, type: 'nested-level3'}); } } customElements.define('c-c', NestedLevel3); </script>