Take code as normally written and enter it in the text-area
below. The result can be directly copied and pasted to your
source page or into a text area and it will display as code
but will not execute. These are the characters converted:

• < to &lt;
• > to &gt;
• "h" in "http://" to &#104;
• "m" in "mailto:" to &#109; AND
• "@" to &#64;

The only known requirement thus far:
The code entered must end with >