How can you tell html5 from HTML?

Related questions

1. What is the difference between html5 and html4?
2. Is body tag required in html5?
3. What is the need of html5?
4. What is YouTube html5 video player?
5. Why html5 is not based on SGML?
6. What is html5 format?
7. Do all browsers support html5?
8. Is Div used in html5?
9. What is the purpose of html5?
10. How html5 is different from HTML?

Tags

1. #safari
2. #webpage
3. #doctype
4. #html5
5. #current
6. #pixels
7. #check
8. #webpages
9. #responsive
10. #browser
11. #source
12. #narrow
13. #chrome
14. #website
15. #confirm
16. #around