How to Add and remove iframe borders (with CSS)

See the Example

index.html

Example: HTML

 <iframe src="/default.asp" width="100%" height="300" style="border:1px solid black;">
</iframe>

<iframe src="/default.asp" width="100%" height="300" style="border:none;">
</iframe>

Output should be:

Type:	html
Category:	Web Tutorial
Sub Category:	HTML Tag
Uploaded by:	Admin