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What would you like to do?
Single file Web Component
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>Single File Web Component</title>
<template id=single-file>
h1 {
color: red;
<h1>Hello World</h1>
<script type=module>
class HelloWorld extends HTMLElement {
constructor () {
const template = document.getElementById('single-file')
this.attachShadow({ mode: 'open' })
connectedCallback () {
console.log('Why hello there 👋')
customElements.define('hello-world', HelloWorld)
const sf = document.getElementById('single-file')
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The polyfill is so small that it’s hard to say “no”, if this use case suits you. We just listed API as “critical” as part of the Web Component Community Group’s presentation to TPAC: so hopefully soon. You can check out the issues linked there for any browser specific questions or worries on this one.

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@Westbrook That is very promising indeed. Thanks for the info!

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