Dialogs & Interactive Elements

🌐 HTML5 🟢 Chapter 30 of 37 📂 Phase 11: HTML APIs & Features 📅 2026 Edition

📌 Covered in this chapter: <details> & <summary> Native Accordion · <dialog> Element · showModal() & close() · Dialog Forms & Focus Trapping · <meter> Gauge · <progress> Bar

Welcome to Phase 11 (Chapter 30): Dialogs & Interactive Elements! Build native modal popups with <dialog>, accordions with <details>, and gauges with <meter> & <progress>.

1Native Dialog & Accordion Example

HTML — Dialog & Details ▶ Run in HTML Editor

<details style="margin-bottom:15px;">
  <summary><strong>What is HTML5?</strong></summary>
  <p>HTML5 is the modern standard for structuring web content.</p>
</details>

<button onclick="document.getElementById('myModal').showModal()">Open Modal Dialog</button>

<dialog id="myModal" style="padding:20px; border-radius:8px;">
  <h3>Modal Dialog</h3>
  <p>This is a native HTML5 modal window!</p>
  <button onclick="document.getElementById('myModal').close()">Close Modal</button>
</dialog>

Written by Our Compiler Technical Editorial Team
Reviewed for accuracy & tested on HTML5 Standards · Last updated August 2026