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HTML Comment

HTML Comment

Multiline Comments

Multiline Comments

Multiline Comments

You have seen how to comment a single line in HTML. You can comment multiple lines by the special beginning tag <!–- and ending tag -–> placed before the first line and end of the lastline to be treated as a comment.

Example

<!DOCTYPE html>
<html>
   <body>
<!--   
This is a multiline comment <br>
and can span through as many as lines you like.
-->
 <p>The above content is commented so you cant see it 
 in output</p>
  </body>
</html>

HTML Document Output

The above content is commented so you cant see it in output

Valid vs Invalid Comments

Valid vs Invalid Comments

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

HTML Document Output

Document content goes here.....

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

HTML Document Output

< !-- This is valid comment -->

Document content goes here.....

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