This is the best app for those who want to learn more about HTML. You can test your knowledge on a variety of HTML topics such as tags, attributes, styles, and much more. You will not only be able to answer questions but you will also be able to see how the app is structured and what you need to do to master it.

If you want to gain a greater understanding of HTML and its many uses, this app is the perfect place to start. It offers over 500 questions that are divided into multiple categories, such as HTML5, CSS, and Web Development.