Preact

by Nicholas Berlette

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

Babel + JSX

/** @jsx h */

import("https://esm.sh/preact/compat").then((React) => {
  class TodoApp extends React.Component {
    constructor(props) {
      super(props)
      this.state = {
        items: [
          { text: "Learn JavaScript", done: false },
          { text: "Learn Preact", done: false },
          { text: "Play around in JSFiddle", done: true },
          { text: "Build something awesome", done: true }
        ]
      }
    }

    render() {
      return (
        <div>
          <h2>Todos:</h2>
          <ol>
          {this.state.items.map(item => (
            <li key={item.id}>
              <label>
                <input type="checkbox" disabled readOnly checked={item.done} /> 
                <span className={item.done ? "done" : ""}>{item.text}</span>
              </label>
            </li>
          ))}
          </ol>
        </div>
      )
    }
  }

  render(new TodoApp(), document.getElementById("app"))
});