HTML vs XHTML
HTML vs XHTML
Understanding their differences helps you write clean, compatible, and future-proof code.
1. What Is HTML?
HTML (HyperText Markup Language) is the standard language of the web.
Key Characteristics
Flexible and forgiving
Case-insensitive tags
Browsers try to fix mistakes automatically
Easy for beginners
Example (HTML – forgiving)
Works even with missing closing tags
2. What Is XHTML?
XHTML (eXtensible HyperText Markup Language) is HTML rewritten using XML rules.
Key Characteristics
Very strict syntax
Case-sensitive (lowercase only)
Must be well-formed
Designed to be processed by XML parsers
Example (XHTML – strict)
Errors are not tolerated
3. Major Syntax Differences
Case Sensitivity
| HTML | XHTML |
|---|---|
<BODY> | Not allowed |
<body> | Required |
Closing Tags
| HTML | XHTML |
|---|---|
<br> | <br /> |
<hr> | <hr /> |
<img> | <img /> |
Attribute Quotation
| HTML | XHTML |
|---|---|
width=100 | Not Required |
width="100" | Required |
Attribute Minimization
| HTML | XHTML |
|---|---|
<input disabled> | Not Required |
<input disabled="disabled" /> | Required |
4. Doctype Difference
HTML5 Doctype (Simple)
XHTML Doctype (Complex)
5. Error Handling
| Feature | HTML | XHTML |
|---|---|---|
| Error tolerance | High | None |
| Browser behavior | Fixes errors | Stops parsing |
| Developer effort | Low | High |
6. MIME Type
| HTML | XHTML |
|---|---|
text/html | application/xhtml+xml |
| Widely supported | Limited browser support |
7. HTML vs XHTML – Quick Comparison Table
| Feature | HTML | XHTML |
|---|---|---|
| Syntax | Flexible | Strict |
| Case sensitivity | No | Yes |
| Closing tags | Optional | Mandatory |
| Error handling | Forgiving | Strict |
| Learning curve | Easy | Hard |
| Modern usage | Yes | Rare |
8. Which One Should You Use Today?
Use HTML5
Modern standard
Easier
Supported everywhere
SEO & accessibility friendly
XHTML Today
Rarely used
Overly strict
No real advantage for modern web apps
HTML5 + clean coding practices = best of both worlds
Key Takeaways
HTML is flexible, XHTML is strict
XHTML follows XML rules
HTML5 is the modern standard
XHTML is mostly obsolete
Write clean HTML even if browsers are forgiving
