You'll need to use special characters (ISO Entities) for your angle brackets (<...>).
Let's say your offering code inside of a textarea for your visitors to copy. As opposed to inserting your code like:
You need to use < and > to make your brackets. Here's an example:
<body bgcolor="#ffffff" text="#000000" link="#0000ff" alink="ff0000" vlink="#800080">
<textarea rows="7" name="displayHTML" cols="45" wrap="virtual" style="width:50%">
Copy/paste/preview the above to see what I mean.
for more special characters.
Sorry for such a brief explaination, reply back here if you need further assistance