Last week, using Notepad, I wrote HTML code for a class assignment and uploaded my work to the school's Web site. After uploading, I checked the code and found that it had changed from what it looked like in Notepad before I uploaded it. For example, I used all lower case when I was writing HTML tags, but after uploading my work, the tags were in upper case. There were other changes as well. This was added: META http-equiv=Content-Type content="text/html; charset=windows-1252", along with other code which I didn't write.

Why did the HTML change when I uploaded it? What would cause code to be automatically added to a Notepad document? I must have made a mistake somewhere. I was wondering if someone could explain to me what my mistake was.

If you uploaded it via a browser-based interface, sometimes the server-side processing of the code will do that for you automagically. It's common among free hosted sites such as GeoCities and Angelfire, where they put in their banner ad code.