You can test your HTML5 skills with w3im Quiz.
The Test
The test contains 25 questions and there is no time limit.
The test is not official, it's just a nice way to see how much you know, or don't know, about HTML5.
Count Your Score
You will get 1 point for each correct answer. At the end of the Quiz, your total score will be displayed. Maximum score is 25 points.
Start the Quiz
Good luck!