HTML Tutorial

HTML Comments

How to Comment in HTML & Comments in JavaScript

Furthermore, web developers often combine HTML comments with JavaScript comments to keep track of scripts. In JavaScript, you can use // for single lines or /* ... */ for multi-line comments. Additionally, knowing the How to comment in HTML shortcut—simply wrap code in —speeds up your workflow and aligns with best practices for HTML comments.

For a quick Html commenting techniques, see the examples below.

1. Single-line HTML Comment

A Single-line HTML Comment is used to add brief notes or explanations within your HTML code without affecting how the page is displayed.

          <!-- This is a single-line HTML comment -->
           <p>Note that no comments are visible in the webpage.</p>

2. Multi-line Comments in HTML and JavaScript

Multi-line Comments in HTML and JavaScript are used to write longer explanations or temporarily disable blocks of code across multiple lines for better readability and code management.

          <!--
  Multi-line comment in HTML
  You can describe sections of your markup here
-->

<!-- Comment line in HTML: <p>Hidden paragraph</p> -->
<p>To add comments in JavaScript you can use the following format;</p>
// JavaScript single-line comment. <br>
/* Example of multi-line comments in JavaScript 
   Comments in JavaScript help explain complex code */

3. Comment Out HTML Code

Commenting out HTML code temporarily disables that section, preventing it from being rendered in the browser without deleting it from the source.

          <!--
  <div>
    <p>This section is disabled and will not render</p>
  </div>
-->

4. Conditional Comments

Conditional comments are special HTML comments used to target and serve specific content to older versions of Internet Explorer or certain email clients like Microsoft Outlook.

    <!--[if IE]>
  <div>
    <p>This message displays only in Internet Explorer.</p>
  </div>
<![endif]-->

<!--[if !IE]-->
  <div>
    <p>This message displays in all browsers except Internet Explorer.</p>
  </div>
<!--<![endif]-->

4. Simple Blog Comment Box in HTML

A Simple Blog Comment Box in HTML allows users to easily leave feedback or responses on your website using a basic text area and submit button.

          <!-- Blog comment HTML code -->
<div class="comment-box">
  <h5>Leave a Comment</h5>
  <textarea placeholder="Add your comment here..." rows="4"></textarea>
  <br />
<br>
  <button type="submit">Submit Comment</button>
</div>

Best Practices for HTML Comments

Keep comments concise yet informative to explain complex sections.
Avoid leaving commented-out code in your final production files; remove unnecessary code comment HTML.
Use comments to outline document structure and add comments to your website HTML code logically.
Regularly review your comment list to ensure they stay relevant.
Remember, CSS comments use /* ... */ to annotate styles and won’t render in the browser.

In the table below we have provided the list of formatting tags that you can use in your HTML code.

Syntax

<!– comment –>

Multi‑line Support

Same syntax spans multiple lines

Nesting

Comments cannot be nested

Valid Placement

Between tags, not inside tag declarations

Browser Behavior

Ignored by browser render, invisible on page

DOM Interface

Represented by the `Comment` node in the DOM API

Conditional Comments

<!–[if IE]>…<![endif]–> (IE ≤9 only)

Questions and Answers related to HTML Comments

+ What are HTML comments and how do you add comments in HTML using the HTML comment tag? >

HTML comments are used to add notes or explanations within the code, which are ignored by browsers. To add a comment, use . Comments are useful for documentation and debugging without affecting the rendered page.

+ How do you comment out HTML code with the proper HTML comments syntax? >

To comment out HTML code, wrap it inside . Example: . This prevents the enclosed code from being rendered by the browser.

+ What are the best practices for writing HTML comments when adding comments to your website HTML code? >

Best practices for HTML comments include keeping them concise, using them to explain complex code, avoiding excessive commenting, and formatting them for readability. Example: .

+ How can you write multi-line comments in HTML and compare them to JavaScript comments? >

HTML supports multi-line comments using . Example: . In JavaScript, multi-line comments use /* */.

+ What is the shortcut for commenting in HTML, and how do you comment multiple lines in HTML using a code comment HTML method? >

In most code editors, use Ctrl + / (Windows) or Cmd + / (Mac) to toggle comments. To comment multiple lines, wrap them inside .

+ How do you add comments in HTML to explain your code, and what are some examples of HTML comments examples? >

Use HTML comments to describe sections of code, making it easier to understand. Example:  before a header section.

+ What techniques can you use for HTML commenting, such as using a comment box in HTML or commenting out HTML lines? >

Techniques include using comments for section markers, debugging, and HTML comment boxes (), which help organize content.

+ How does writing comments in HTML differ from adding comments in Jupyter Notebook or using Bootstrap comment box? >

HTML comments use , while Jupyter Notebook uses # for Markdown cells. Bootstrap doesn’t have a built-in comment box but uses styled divs.

+ What are some common HTML comments syntax errors to avoid when you comment line in HTML? >

Avoid nesting comments, unclosed tags, and using -- within comments. Always close comments properly with -->.

+ How do you compare HTML comments with CSS comments and what are the differences in their syntax? >

HTML comments use  and are ignored by browsers. CSS comments use /* */ and apply only within stylesheets.

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