HTML Comments

Comment annotations embed invisible developer notes within markup, remaining hidden from browser rendering while providing code documentation.

Comments enhance code maintainability by preserving contextual information. These annotations serve documentation purposes, facilitate team collaboration through explanatory notes, and enable temporary content suppression during development cycles.

Comment Notation Patterns

Comment blocks initiate with <!-- and terminate with -->. Browsers disregard all enclosed content during page rendering.

Standard Comment Notation

<!-- Developer annotation appears here -->

<h1>Discover HTML Free Codes</h1>

<!-- Content explanation for maintainers -->
<p>Master markup languages through structured education.</p>

<!-- Creator: Development Team -->
<!-- Revision date: 2024 -->

Result:

Discover HTML Free Codes

Master markup languages through structured education.

Extended Annotation Blocks

Comments accommodate multi-line content, providing space for comprehensive documentation and detailed technical notes.

Multi-line Annotation Patterns

<!--
    Extended annotation spanning
    multiple consecutive lines.

    Accommodates comprehensive explanations,
    technical specifications, or maintenance records.

    Website: htmlfreecodes.com
    Contact: support@htmlfreecodes.com
-->

<header>
    <!--
        Navigation Menu:
        - Home: Links to main page
        - Tutorials: HTML learning resources
        - Contact: Get in touch with us
    -->
    <nav>
        <ul>
            <li><a href="/">Home</a></li>
            <li><a href="/tutorial/index.html">Tutorials</a></li>
            <li><a href="/contact">Contact</a></li>
        </ul>
    </nav>
</header>

Result:

Commenting Out HTML Elements

You can temporarily hide HTML elements by wrapping them in comments. This is useful for testing, debugging, or temporarily removing content.

Commenting Out Elements

<h1>Active Content</h1>
<p>This paragraph is visible to users.</p>

<!-- Temporarily hidden content
<h2>Coming Soon</h2>
<p>This section is under development.</p>
<ul>
    <li>Feature 1: In progress</li>
    <li>Feature 2: Planned</li>
    <li>Feature 3: Testing</li>
</ul>
-->

<p>Visit <a href="https://htmlfreecodes.com">htmlfreecodes.com</a> for more tutorials.</p>

<!-- TODO: Add contact form here -->

Result:

Active Content

This paragraph is visible to users.

Visit htmlfreecodes.com for more tutorials.

Using Comments for Code Organization

Comments help organize your HTML code into logical sections, making it easier to navigate and maintain large files.

Code Organization Examples

<!-- ===== HEADER SECTION ===== -->
<header>
    <h1>HTML Free Codes</h1>

    <!-- Primary navigation -->
    <nav class="main-nav">
        <ul>
            <li><a href="/">Home</a></li>
            <li><a href="/tutorial/index.html">Tutorials</a></li>
        </ul>
    </nav>
</header>

<!-- ===== MAIN CONTENT AREA ===== -->
<main>
    <!-- Hero section with introduction -->
    <section class="hero">
        <h2>Learn HTML from Scratch</h2>
        <p>Comprehensive tutorials at htmlfreecodes.com</p>
    </section>

    <!-- Tutorial content -->
    <section class="tutorials">
        <h2>Our Tutorials</h2>
        <p>Step-by-step HTML learning resources.</p>
    </section>
</main>

<!-- ===== FOOTER SECTION ===== -->
<footer>
    <p>© 2024 HTML Free Codes</p>
</footer>

Result:

HTML Free Codes

Learn HTML from Scratch

Comprehensive tutorials at htmlfreecodes.com

Our Tutorials

Step-by-step HTML learning resources.

© 2024 HTML Free Codes

Development Notes and TODOs

Comments are perfect for leaving development notes, TODOs, and important reminders for yourself or team members.

Development Comments Examples

<!--
    TODO List:
    - Add responsive design
    - Optimize images
    - Implement contact form validation
    - Add social media links
-->

<form action="/contact" method="post">
    <!-- BUG: Form validation not working in Safari -->
    <!-- FIXME: Add proper error handling -->

    <label for="email">Email:</label>
    <input type="email" id="email" name="email" required>

    <!-- NOTE: This field is optional for now -->
    <label for="phone">Phone (optional):</label>
    <input type="tel" id="phone" name="phone">

    <!-- IMPORTANT: Add CSRF protection before production -->
    <button type="submit">Send Message</button>
</form>

<!--
    Performance Notes:
    - This page loads in 2.3 seconds
    - Consider lazy loading for images
    - Minify CSS and JavaScript

    Contact: dev-team@htmlfreecodes.com
-->

Result:

Complete Comments Example

Here's a comprehensive example showing various ways to use HTML comments effectively:

Complete Comments Example

<!DOCTYPE html>
<html lang="en">
<head>
    <title>HTML Free Codes - Comments Tutorial</title>
    <!-- Meta tags for SEO and social sharing -->
    <meta name="description" content="Learn HTML comments">
</head>
<body>
    <!--
        Website: HTML Free Codes
        Version: 2.1
        Last Updated: 2024
        Author: HTML Free Codes Team
    -->

    <!-- ===== MAIN CONTENT ===== -->
    <main>
        <h1>HTML Comments Tutorial</h1>

        <!-- Introduction section -->
        <section>
            <p>Comments help document your HTML code.</p>

            <!-- Example list -->
            <ul>
                <li>Document your code</li>
                <li>Leave development notes</li>
                <li>Organize code sections</li>
            </ul>
        </section>

        <!-- TODO: Add interactive examples -->
    </main>

    <!-- WARNING: Never put passwords in comments! -->
</body>
</html>

⚠️ Security Warning

Never put sensitive information in HTML comments! Comments are visible in the page source and can be seen by anyone viewing your website. Avoid including passwords, API keys, database credentials, or any confidential data.

Try it Yourself

Practice using HTML comments in your own code!

Try Comments Example

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