HTML Comments

Where people are unable to see these comments is whenever people browse the webpage, but they can be seen by anyone that inspects the source code of the page. Comments are a good practice because however well you know the code when you write it, it’s so much easier to add comments than to comprehend the code without them when you come back to it (or have someone else) later.

Comments are often used to tell which is the beginning and end of sections or to provide notes to others to help understand the code structure on longer pages. An example of this is that comments could show where in the feature specific things, like navigation or content sections, begin and finish. Comments can also be used strategically around blocks of code to temporarily disable them, without having to delete the whole block altogether.

Comments help make code more readable but they’re code, and anyone reading the page can see the comments. In other words, though comments are very helpful to organization and cooperation, never write sensitive information in comments.