Text area with highlight

Text area is a form provided to write HTML code to be displayed in the post page or in the sidebar for a variety of purposes, like creating articles, making LinkExchange, comments, etc.

 Kode Teks Area:

<textarea name="code" rows="6" cols="20">Write code here</textarea>

The results are as follows

Write code here

 Further, how to create a text area with highlights.
Code like the following:

<div><form name="copy"><div align="center"><input onclick="javascript:this.form.txt.focus();this.form.txt.select();" type="button" value="Highlight All"> </div><div align="center"></div><p align="center"><textarea style="WIDTH: 300px; HEIGHT: 144px" name="txt" rows="100" wrap="VIRTUAL" cols="55">

write code here

</textarea></p></form></div>

The results are as follows

write code here

Similarly blog tutorial on how to create a text area with highlights. Hopefully the info useful