Enter some HTML and click Echo.
Example:
<font color="red">Hello</font>
Changer the format to xml and enter some data.
<hash><name>Bobby</name></hash>
Enter JavaScript.
<script language="javascript">
alert("Hi");
</script>
Enter a color value.
<p style="background-color:#9c0; width:100px; height:100px; line-height:100px; text-align:center; margin:auto;"> #9c0 </p>