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How to Write Clear and Effective Comments in HTML Code: A Comprehensive Guide

Learn the importance of commenting in HTML code and how to write clear and effective comments using proper syntax and conventions. This comprehensive guide covers everything from basic commenting techniques to advanced tricks and best practices.

As a web developer, writing clear and effective comments in your HTML code is an important part of your job. Not only do comments help you keep track of what you’re doing, but they also make it easier for others to understand your code. In this comprehensive guide, we’ll cover everything you need to know about writing comments in HTML, including the syntax and how to create multiline comments .

Understanding HTML Comments

HTML comments are used to add notes or explanations to your code. They’re not displayed on the web page, but are instead used to help you and other developers understand the purpose of your code. Comments are ignored by the browser, so they won’t affect the appearance or functionality of your web page.

To create a comment in HTML, you use the tags. Anything you put between these tags will be treated as a comment. Here’s an example:

Comments can also be used for organization and clarity. For example, you can use comments to separate different sections of your code or to add headings that make it easier to navigate your code.

It’s important to note that comments in HTML can only be single-line. If you want to create a multiline comment, you’ll need to use the tags on each line. We’ll cover this in more detail in the next section.

Creating Multiline Comments

Multiline comments are useful when you need to add longer explanations or notes to your code. To create a multiline comment in HTML, you’ll need to use the tags on each line. Here’s an example:

When creating multiline comments, it’s important to format them in a way that makes them easy to read. You should use proper indentation and spacing to make your comments stand out from the rest of your code.

How to Comment in HTML

Adding Comments to HTML and CSS

Comments can also be used in CSS code to add notes or explanations. To add a comment in CSS, you’ll need to use the /* and */ tags. Here’s an example:

Comments in CSS can also be used for organization and clarity. For example, you can use comments to group related styles together or to add headings that make it easier to navigate your code.

When using comments in both HTML and CSS code, it’s important to be consistent with your formatting and syntax. This will make your code easier to read and understand for yourself and other developers.

Advanced Commenting Techniques

Comments can be used for more than just adding notes and explanations to your code. They can also be used for debugging and troubleshooting, as well as for temporarily disabling or “commenting out” lines of code.

For example, if you’re having trouble with a particular section of your code, you can add a comment to temporarily disable that section of code. This can help you isolate the problem and make it easier to find a solution.

Comments can also be used with accessibility features like screen readers. By adding descriptive comments to your code, you can make your web page more accessible to users with disabilities.

If you’re looking for additional tools or plugins to help you with commenting in HTML, there are several available online. These tools can help you automate the process of adding comments to your code, or provide additional features like syntax highlighting and error checking.

Best Practices and Examples

To write clear and effective comments in HTML code, there are several best practices you should follow. First, you should always use proper syntax and formatting for your comments. This will make them stand out from the rest of your code and make them easier to read.

You should also avoid using comments to state the obvious. For example, if you’re using a tag to create a heading, there’s no need to add a comment that says “This is a heading”. Instead, use comments to explain why you’re using a particular tag or to add notes that are relevant to your code.

Here’s an example of HTML code with clear and effective commenting:

Other helpful code examples for writing comments in HTML pages

In html, comment in html code example

In html, comment in html code example

In html, how to comment in html code example

In html, html how to add comment code example

And this is a header. It will be fully visible.
 

In html, comments in html code example

In typescript, comments in html code example

/* CSS multiline comment */# Pyhton comment// Javascript/C comment /* Javascrpit/C multiline comment */

In html, how to comment in html code example

 /* This is CSS */ // This is CSS to

In html, how do i comment in htmle code example

 
This text is visible. Check the source code for multi-line comment.
 

In html, comment in HTML code example

In html, comment in html code example

Conclusion

In conclusion, writing clear and effective comments in HTML code is an important part of web development. By using proper syntax and formatting, you can make your comments stand out from the rest of your code and make it easier for yourself and other developers to understand your work.

Remember to use comments for organization and clarity, and to avoid stating the obvious. By following these best practices and using the tips and techniques discussed in this guide, you can become an expert at writing comments in HTML code.

Frequently Asked Questions — FAQs

Why is commenting important in HTML code?

Commenting in HTML code helps other developers understand your code better, makes it easier to maintain and update code over time, and can improve accessibility for users with disabilities.

What is the syntax for creating single-line comments in HTML?

How do I create multiline comments in HTML?

Can I use comments in CSS code as well?

Are there any tools or plugins available for HTML commenting?

Yes, there are several commenting plugins and tools available for HTML development, such as Atom’s «comment» package or Sublime Text’s «Better Comments» plugin.

What are some common mistakes to avoid when writing comments in HTML code?

Common mistakes include writing comments that are too vague or redundant, not using proper syntax, and not keeping comments up to date with code changes.

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HTML Comments

HTML comments are not displayed in the browser, but they can help document your HTML source code.

HTML Comment Tag

You can add comments to your HTML source by using the following syntax:

Notice that there is an exclamation point (!) in the start tag, but not in the end tag.

Note: Comments are not displayed by the browser, but they can help document your HTML source code.

Add Comments

With comments you can place notifications and reminders in your HTML code:

Example

Hide Content

Comments can be used to hide content.

This can be helpful if you hide content temporarily:

Example

This is another paragraph

—>

You can also hide more than one line. Everything between the will be hidden from the display.

Example

Hide a section of HTML code:

This is a paragraph.

Look at this cool image:

—>

This is a paragraph too.

Comments are also great for debugging HTML, because you can comment out HTML lines of code, one at a time, to search for errors.

Hide Inline Content

Comments can be used to hide parts in the middle of the HTML code.

Example

Hide a part of a paragraph:

HTML Exercises

COLOR PICKER

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HTML Comment – How to Comment Out a Line or Tag in HTML

Dionysia Lemonaki

In this article, you’ll learn how to add single and multi-line comments to your HTML documents.

You’ll also see why comments are considered a good practice when writing HTML code.

The HTML Comment Tag

The general syntax for an HTML comment looks like this:

Comments in HTML start with .

Don’t forget the exclamation mark at the start of the tag! But you don’t need to add it at the end.

The tag surrounds any text or other HTML tag you want to comment out.

When to Use HTML Comments

HTML comments don’t get displayed in the browser. This means that any comments you add to your HTML source code will not be shown when the document gets rendered in a web browser.

That being said, keep in mind that anyone can view the source code of practically every website published on the Internet by going to View -> Developer -> View Source – and this also includes all comments!

So your comments will be visible for others to see if you make the HTML document public and they choose to look at the source code.

Writing comments is helpful and it’s a good practice to follow when writing source code. Comments help you document and communicate about your code and thought process to yourself (and others). It also reminds you what you were thinking/doing when you come back to a project after months of not working on it.

Comments also help you communicate with other developers who are working on the project with you. Your comments can clearly explain to them why you added certain lines of code.

How to Write Single-Line Comments in HTML

A single-line comment only spans one line. As mentioned earlier, that line will not get displayed in the browser.

Use a single-line comment when you want to explain and clarify the purpose behind the code that follows it or when you want to add reminders to yourself like so:

         
About me
 
I am learning to code with freeCodeCamp.
 
I am going through each and every one of their awesome and super helpful certifications.
 
I am on my way to becoming a fullstack web developer!
 
Work Experience
   

Single-line comments are also helpful when you want to make clear where a tag ends. This comes in handy in a long and complex HTML document where a lot is going on and you may get confused as to where a closing tag is situated.

How to Write Inline Comments in HTML

You can also add comments in the middle of a sentence or line of code.

Only the text inside the will be commented out, and the rest of the text inside the tag won’t be affected.

        
I am a web developer
   

How to Write Multi-Line Comments in HTML

Comments can also span multiple lines, using the exact same syntax you’ve seen so far.

        
I am a web developer
  

How to Comment Out a Tag in HTML

So what if you want to comment out a tag in HTML?

You wrap the tag you’ve selected in , like so:

 !DOCTYPE html>       
My portfolio page
 
freeCodeCamp certification projects
 --> 
About Me
   

Commenting out tags helps with debugging.

When something isn’t working the way it’s supposed to or they way you intended it to, start commenting out individual tags one by one. This lets you test them and see which one is causing the issue.

Keyboard Shortcut for Adding HTML Comments

There are shortcuts you can use for adding comments – and you’ll probably end up using them a lot. The shortcut is Command / for Mac users or Control / for Windows and Linux users.

To add a single-line comment, just hold down the combo of keys shown above inside the code editor. Then the whole line you’re on will be commented out. Just keep in mind that since everything will be commented out on that line, this only works for single-line comments. You’ll need to add inline comments manually.

For adding multi-line comments, select and highlight all the text or tags you want to comment out and hold down the two keys shown previously. Each line you selected will now have a comment.

Conclusion

And there you have it – now you know how and why to use comments in HTML!

Learn more about HTML by watching the following videos on freeCodeCamp’s YouTube channel:

freeCodeCamp also offers a free, project-based certification on Responsive Web Design.

It is ideal for complete beginners and assumes no previous knowledge. You’ll start from the absolute necessary basics and build your skills as you progress. In the end, you’ll complete five projects.

Thanks for reading and happy learning 🙂

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