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When a browser reads a marked-up document, such as the “hello world” example repeated here,
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Hello HTML World</title> <!-- Simple hello world in HTML 4.01 strict example --> </head> <body> <h1>Welcome to the World of HTML</h1> <hr> <p>HTML<em>really</em> isn't so hard!</p> <p>Soon you will ♥ using HTML.</p> <p>You can put lots of text here if you want. We could go on and on with fake text for you to read, but let's get back to the book.</p> </body> </html>