This screen is part of a Web Feed Reference section for the Web Feed Generator. Please ask us if you cannot find the answer to your question.
HTML is the technical term for the format used to create normal Web pages. The "M" stands for markup, which is a standard way of marking text so that Web browsers can display it as a heading, paragraph or a list, for example. Each part of the Web page is known as an element, which may be nested one within another, and elements may have attributes that are like special instructions to help the Web browser display the page correctly.
When you open a Web page in your Web browser, the HTML is normally hidden behind the scenes, so you do not have to read it directly. Most Web browsers have the option to "View source" that will show you the markup itself.
The Web Feed Generator downloads your Web page and converts the text to a Web Feed.