8. HTML – COMMENTS

Comment is a piece of code which is ignored by any web browser. It is a good practice to add comments into your HTML code, especially in complex documents, to indicate sections of a document, and any other notes to anyone looking at the code. Comments help you and others understand your code and increases code readability.
HTML comments are placed in between <!– … –> tags. So, any content placed with-in <!– … –> tags will be treated as comment and will be completely ignored by the browser.

Example

<!DOCTYPE html>
<html>
<head> <!– Document Header Starts –>
<title>This is document title</title>
</head> <!– Document Header Ends –>
<body>
<p>Document content goes here…..</p>
</body>
</html>

This will produce the following result without displaying the content given as a part of comments:
Document content goes here…..

Valid vs Invalid Comments


Comments do not nest which means a comment cannot be put inside another comment. Second the double-dash sequence “–” may not appear inside a comment except as part of the closing –> tag. You must also make sure that there are no spaces in the start-of-comment string.

Example

<!DOCTYPE html>
<html>
<head>
<title>Valid Comment Example</title>
</head>

<body>
<!– This is valid comment –>
<p>Document content goes here…..</p>
</body>
</html>

But, following line is not a valid comment and will be displayed by the browser. This is because there is a space between the left angle bracket and the exclamation mark.

<!DOCTYPE html>
<html>
<head>
<title>Invalid Comment Example</title>
</head>
<body>
< !– This is not a valid comment –>
<p>Document content goes here…..</p>
</body>
</html>

This will produce the following result:
< !– This is not a valid comment –>
Document content goes here…..

Multiline Comments


So far we have seen single line comments, but HTML supports multi-line comments as well.
You can comment multiple lines by the special beginning tag <!– and ending tag –> placed before the first line and end of the last line as shown in the given example below.

<!DOCTYPE html><html>
<head>
<title>Multiline Comments</title>
</head>
<body>
<!–
This is a multiline comment and it can
span through as many as lines you like.

–>
<p>Document content goes here…..</p>
</body>
</html>

This will produce the following result:
Document content goes here…..

Conditional Comments


Conditional comments only work in Internet Explorer (IE) on Windows but they are ignored by other browsers. They are supported from Explorer 5 onwards, and you can use them to give conditional instructions to different versions of IE.

Example

<!DOCTYPE html><html>
<head>
<title>Conditional Comments</title>
<!–[if IE 6]>
Special instructions for IE 6 here
<![endif]–>
</head>
<body>
<p>Document content goes here…..</p>
</body>
</html>

You will come across a situation where you will need to apply a different style sheet based on different versions of Internet Explorer, in such situation conditional comments will be helpful.

Using Comment Tag


There are few browsers that support <comment> tag to comment a part of HTML code.

Example

<!DOCTYPE html><html>
<head>
<title>Using Comment Tag</title>

</head>
<body>
<p>This is <comment>not</comment> Internet Explorer.</p>
</body>
</html>

If you are using IE, then it will produce following result:
This is Internet Explorer.
But if you are not using IE, then it will produce following result:
This is Internet Explorer.

Commenting Script Code


Though you will learn JavaScript with HTML, in a separate tutorial, but here you must make a note that if you are using Java Script or VB Script in your HTML code then it is recommended to put that script code inside proper HTML comments so that old browsers can work properly.

Example

<!DOCTYPE html><html>
<head>
<title>Commenting Script Code</title>
<script>
<!–
document.write(“Hello World!”)
//–>
</script>
</head>
<body>
<p>Hello , World!</p>
</body>
</html>

This will produce the following result:

Commenting Style Sheets


Though you will learn using style sheets with HTML in a separate tutorial, but here you must make a note that if you are using Cascading Style Sheet (CSS) in your HTML code then it is recommended to put that style sheet code inside proper HTML comments so that old browsers can work properly.

Example

<!DOCTYPE html><html>
<head>
<title>Commenting Style Sheets</title>
<style>
<!–
.example {
border:1px solid #4a7d49;
}
//–>
</style>
</head>
<body>
<div class=”example”>Hello , World!</div>
</body>
</html>

This will produce the following result:

Hello, World!

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1 thought on “8. HTML – COMMENTS”

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