Viewing the source of a web page is a time honored tradition among web developers. When you see something cool, the first thing to do is look under the hood to see if we can figure out how to do that. But a lot of newcomers to web design don't realize that this isn't "cheating" or illegal or something. While downloading a website and replacing the content with your own is a violation of copyright, just looking at it is not a crime at all. And looking at the source of HTML and CSS pages that you admire is a great way to improve your own designs.
looking at source don’t give so much to developer as it give to designers, they can learn from other designers work
@Shimaa I disagree. As a developer I’ve gotten a LOT from looking at the source code. Yes, you can’t look at server-side scripts like PHP, but you can look at JavaScript and CSS and HTML and how they interact together.
Thanks for the comment.