Why use percentage value for div's width in CSS?

Question

I am reading articles about css. I found out that many of writers suggest to use % value for div\'s width or height.

I am using pixels all the time.

Why should I

Answer 1

Save the following html to a file and open it with your web browser. Now change the size of the web browser window, notice the percent will expand and contract and the pixels don't.

PIXELS


PERCENT