maxwellbo.github.io/i-do-not-like-web-components.html at master · MaxwellBo/maxwellbo.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>I do not like Web Components</title>
  <link
    rel="stylesheet"
    href="https://esm.sh/jsr/@celine/celine@4.8.0/cell.css" />
  <link
    rel="stylesheet"
    href="https://esm.sh/jsr/@celine/libertine@10.0.0/libertine.css" />
</head>
<body>
  <main>
    <h1>I do not like Web Components</h1>

    <p>
      I have recently had the displeasure of using Web Components
    </p>


    <h2>The shadow DOM always encapsulates CSS</h2>

    <p>
    </p>

    <h2>The lifecycle is inscrutable</h2>

<script class="echo">class MyComponent extends HTMLElement {
  constructor() {
    super();
    const shadow = this.attachShadow({mode: 'open'});
    shadow.innerHTML = `
      <style>
        p {
          color: red;
        }
      </style>
      <p>Hello, world!</p>
    `;
  }

  connectedCallback() {
    console.log('connected');
  }

  get foo() {
    return 'foo';
  }
}

const el = document.createElement('my-component');

console.log("foo", el.foo);
console.log(el instanceof MyComponent);

customElements.define('my-component', MyComponent);

console.log("foo", el.foo);
console.log(el instanceof MyComponent);


customElements.whenDefined('my-component').then(() => {
  console.log('defined');
console.log("foo", el.foo);
  console.log(el instanceof MyComponent);
});

// document.getElementsByTagName('main')[0].appendChild(el);
// console.log("foo", el.foo);
// console.log(el instanceof MyComponent);

</script>


  </main>
</body>
</html>