Chapter 19. How Markup Languages Work
Markup languages are the road signs of a web page. They are sets of directions that tell the browser software how to display and manage a web document, much like written music scores are instructions that tell a musician how to play a particular song. These instructions (called tags or markups) are embedded in the source document that creates the web page.
Tags reference graphic images located in separate files, and they instruct the browser to retrieve and display these images within the page. Tags can also tell a browser to connect a user to another file or URL when he clicks an active hyperlink. ...
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