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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
Here, the given comment is a valid comment and will be wiped off by the browser.
<100CTYPE 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:
<1-This is not a valid comment→→
Document content goes here.....
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