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HTML Comments

Learn to leave invisible notes for yourself and your team, and master the art of debugging HTML.

comments.html

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Tutor:In HTML, we sometimes need to write notes that the browser shouldn't display. These are called Comments. They are invisible to the user but visible to the developer in the code.

Skill Matrix

UNLOCK NODES BY MASTERING COMMENTS.

Concept: Syntax

Comments start with .

System Check

Which of these is a valid HTML comment?

// This is a comment<-- This is a comment -->/* This is a comment */

Community Holo-Net

Documentation Styles

ACTIVE

How do you document your code? Share your comment templates and best practices.

Support Us

The Art of Invisible Code

Pascual Vila

Frontend Instructor // Code Syllabus

HTML Comments are the "Dark Matter" of the web. They make up a significant portion of the codebase, holding it together with explanations and legacy code, yet they remain invisible to the end-user.

Documentation

The primary use of comments is to explain your code. When working in teams, or even coming back to your own code after six months, comments act as signposts. A simple  can save minutes of searching.

Debugging (Commenting Out)

When a layout breaks, developers often "comment out" sections of HTML to isolate the problem. By wrapping a suspicious block in , you can temporarily remove it without deleting the code permanently.

Security Risks

Never, ever store passwords, API keys, or personal data in comments. While the browser doesn't render them, they are still downloaded to the user's computer. Anyone can Right-Click > View Page Source to read them.

View Full Transcript+

This section contains the full detailed transcript of the video lessons for accessibility purposes and quick review. It covers the syntax of comments, the use cases for documentation and debugging, and security implications.

Glossary

Comment Syntax: The specific characters used to denote a comment: starts with .
Commenting Out: The practice of wrapping code in comment tags to temporarily disable it without deleting it from the file.
Minification: A process where all comments and whitespace are removed from the production code to reduce file size.
View Source: A browser feature that allows users to see the raw HTML code, including all comments that are invisible on the rendered page.