I'm used to Windows. I open notepad or wordpad and type <html> Hello world </html> and save it as a .txt file with an .html extension. How do I do this on a Mac? It seems the free included text editor is called textEdit. But it does not allow me to save as a simple txt file with an .html extension. I can choose .html as the file type, but it doesn't execute my code as a web page. It just echos my code back to me when I open the file in a browser.