You can test your HTML skills with W3Schools' Quiz.

The Test
The test contains 40 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 HTML.

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 40 points.