This ("html5 explained.htm") is a detail HTML5 file with all the important HTML5 tags explained using comments.
HTML pages are basically text files with .htm or .html extensions.
I have created this "html5 explained.htm" file for my own personal referance. Beside that any one can learn html just by reading this file. If you are interested please download the file named "html5 explained.htm" and open it in a code editor and read line by line. Visual Studio Code or VSCode is the best code editor these days. You may want to Download VSCode.