esp-link/examples/web-server/LED.html

  <div class="header">
    <h1>LED configuration</h1>
  </div>

  <div class="content">
    <p>
      <button id="btn_on" type="button">Turn on</button>
      <button id="btn_blink" type="button">Start blinking</button>
      <button id="btn_off" type="button">Turn off</button>
    </p>
    <p id="text"/>
    <p>
      <form>
        Frequency:
        <input type="range" name="frequency" min="1" max="25">
        <input type="submit">
      </form>
    </p>
  </div>
</body></html>