I have been using a Mac to follow Lesson 2. All is OK, except viewing the lesson02.html as a web page. I have used Textedit to edit the file. On one occasion it opened in MS Word for Mac in Web page form, but then it has either opened in the plain text form or in text without any line breaks. I tried opening it in IE (using Parallels) but that didn't work, and tried with Chrome and Safari, but then it just opens as a text file, not a web page.
How can I make it work reliably using a Mac, if necessary also using Parallels, but preferably without sing Parallels?