HTML, short for HyperText Markup Language, is the predominant markup language for the creation of web pages.
The World Wide Web Consortium (W3C) is the main international standards organization for the World Wide Web

File extension: .html, .htm
HTM or HTML Extension? When you save an HTML file, you can use either the .htm or the .html extension. It might be a bad habit inherited from the past when some of the commonly used software only allowed three letter extensions. With newer software we think it will be perfectly safe to use .html.

Here's a dynamite small script to use that takes away those lines under links.
You need to insert it in the <head> </head> section of your page.
<STYLE><!--a{text-decoration:none}//--></STYLE>

  1. How to Display Html code in a web page<xmp> </xmp> and &lt &gt
  2. Simple HTML<html> <head> <body>
  3. DOCTYPE<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4. html<html> </html>
  5. head<head> </head>
  6. title<title> </title>
  7. body:<body> </body>
  8. p tags<p> </p>
  9. H1 through H6 tags <h1> </h1>
  10. Comments: tags /*Comment */
  11. Link:A tags <a href="/../html/default.aspx">Home</a>
  12. List: tags<OL> <LI> <LI> <LI> </OL>
  13. Character: tags<em></em><strong></strong><code></code><tt></tt><u></u>
  14. Preformatted Text: tags<pre> </pre>
  15. Horizontal Rules: <hr>
  16. Line Break: <br />
  17. Address: <address> </address>
  18. Blockquote: <blockquote> </blockquote>
  19. Special Characters: &lt; &gt: &amp; & quot:
  20. Image Formats: <IMG>
  21. Table: <table> </table>
  22. Form: <form></form>