What is the difference between html5 and html4?

Related questions

1. Why html5 is not based on SGML?
2. Why we use html5 instead of HTML?
3. How html5 is different from HTML?
4. What is div in HTML with example?
5. What is html5 format?
6. How do you put a div in HTML?
7. What are the html5 semantic tags?
8. Why is html5 good?
9. Does Windows XP support html5?
10. Is body tag required in html5?

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