Comment tags are used to insert comments in the HTML source code.
You can add comments to your HTML source by using the following syntax:
<!-- Write your comments here -->
With comments you can place notifications and reminders in your HTML:
<!-- This is a comment --> <p>This is a paragraph.</p> <!-- Remember to add more information here -->
<!-- Do not display this at the moment <img border="0" src="pic_trulli.jpg" alt="Trulli"> -->
Must start with a document type declaration: <!DOCTYPE html>. The HTML document itself begins with <html> and ends with </html>. The visible part of the HTML document is between <body> and </body>.