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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> <x-x id="aa"></x-x> <y-y id="bb"></y-y> <script> 'use strict'; customElements.define('x-x', class extends HTMLElement { constructor() { super(); reactions.push({ type: 'constructor', element: this }); } }); </script>