🧠 15. What are Void Elements?
Void elements do not require closing tags.

Examples:
- <br>
- <hr>
- <img>
- <input>

🧠 16. What is the Purpose of alt Attribute?
alt provides alternative text for images.

Example:
<img src="cat.jpg" alt="Cute Cat">

Benefits:
✅ Accessibility
✅ SEO
✅ Backup text if image fails

🧠 17. Explain Audio and Video Tags
HTML5 provides multimedia support.

Audio Example:
<audio controls>
<source src="song.mp3">
</audio>

Video Example:
<video controls width="400">
<source src="movie.mp4">
</video>

🧠 18. What is Accessibility in HTML?
Accessibility means making websites usable for everyone.

Best Practices:
- Semantic HTML
- Alt text
- Proper headings
- Keyboard support

🧠 19. What are ARIA Attributes?
ARIA improves accessibility for screen readers.

Example:
<button aria-label="Search">

Common ARIA Attributes:
- aria-label
- aria-hidden
- aria-expanded

🧠 20. Difference Between <strong> and <b>
<strong> : Semantic importance
<b> : Only bold styling

<strong> : Used for important text
<b> : Used for design

Example:
<strong>Important</strong>

<b>Bold Text</b>

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