Use for questions about the use of HTML on web applications from the end-user point of view. HTML questions about developing a web application are OFF-TOPIC.
HyperText Markup Language is the major markup language used for creating web pages.
Use this tag for question about the use of HTML from the point of view of a web application end-user.
For questions from the point of view of a web app developer, checkout http://stackoverflow.com/questions/tagged/html/info
There are many web applications that allow their users to edit an HTML template or to include content by using HTML including but not limited to:
Usually they use HTML 4. For questions about HTML 5 use html5.