Can Web-Design be considered an art?

I have a portfolio to fill out in my art class, but the teacher told me that web-designing is not an art and would not let me do it unless I can convince her otherwise. Does anyone have any suggestions to help me convince this teacher and prove to her that web-design really is an art form? I have read an article from a web site design company site about this topic that web design is an art. If you know that then please help me to convince my teacher. Thanks for your help!