When you look at a web page in Microsoft internet Explorer, it may very well look different that it does in Netscape navigator. For example, blinking text and javascript ar both handled differently.
Web pages are text.
If you use a PC, you should use notepad and is you use a MAC, simple text will do. We will talk about editors in week 4. Explorer does not. If a tag is not supported, it is ignored. Navigator viewers will see it blink.