View Source
To see a copy of the file that your browser reads to generate the information in your current window, select View Source (or the equivalent) from your browser menu.
The file contents, with all the HTML tags, will be displayed in a new window.
This is an excellent way to learn HTML. Of course, the HTML might not be technically correct.
You can save a source file with the HTML codes and use it as a template for one of your Web pages.