HTML comment tag
HTML comments start with < !-- tag and end with -- > tag.
Comments are not displayed in the web browsers. Any HTML elements that are encapsulated inside of the comment tags will be ignored by the web browsers. Comments will help the author or visitor to describe and explain the HTML code, who visited the HTML source code.
HTML Source Code :
HTML multiple line comments are also the same syntax. HTML dont allow nested comments , that is, a comment inside another comment.