On Mac, I created a file with very simple html, for example. <h1>my web page</h1> I save it as .html. I am running firefox or Opera and I am using an open file, but I just see the content as an html source, for example. I see <b> tags, etc.
If you need all the code here:
<html> <head> </head> <body> <h1>My Web Page</h1> </body> </html>
Edit: Rich Text format was a problem. See my answer below.
junky source share