HTML Tutorial: HTML vs XHTML
Learn the differences between HTML and XHTML, including syntax rules, self-closing tags, and case sensitivity with colorful examples
HTML and XHTML are both markup languages for creating web pages, but they have key differences. HTML is flexible, while XHTML is strict and XML-based.
1️⃣ Syntax Differences
HTML INPUT:
<p>Hello World</p>
<br>
<img src="image.jpg">
XHTML INPUT:
<p>Hello World</p>
<br />
<img src="image.jpg" />
OUTPUT:
Hello World
(Line break)
(Image displayed)
✔️ XHTML requires self-closing tags like <br /> and <img />
✔️ HTML allows <br> and <img> without closing slash
2️⃣ Case Sensitivity
HTML INPUT:
<TITLE>My Page</TITLE>
XHTML INPUT:
<title>My Page</title>
OUTPUT:
Page Title: My Page
✔️ HTML tags are case-insensitive ✔️ XHTML tags must be lowercase
3️⃣ Closing All Tags
HTML INPUT:
<div>
<p>Content here</p>
XHTML INPUT:
<div>
<p>Content here</p>
</div>
OUTPUT:
Content here
✔️ XHTML requires all tags to be properly nested and closed ✔️ HTML is more forgiving with unclosed tags
4️⃣ Attribute Quotes
HTML INPUT:
<img src=image.jpg alt=MyImage>
XHTML INPUT:
<img src="image.jpg" alt="MyImage" />
OUTPUT:
Image displayed with alt text: MyImage
✔️ XHTML requires quotes around all attribute values ✔️ HTML allows unquoted attribute values in many cases
5️⃣ Summary of Differences
| Feature | HTML | XHTML |
|---|---|---|
| Tag Case | Case-insensitive | Lowercase only |
| Self-closing Tags | Optional | Required (<br />, <img />) |
| Attribute Quotes | Optional | Mandatory |
| Tag Nesting | Flexible | Strictly nested |
🚀 What’s Next?
👉 HTML Forms
Next lesson will cover:
- HTML forms for user input
- Form elements, input types, and attributes
- Creating interactive web pages
Understanding the differences between HTML and XHTML ensures proper syntax, cross-browser compatibility, and cleaner, maintainable code.