Live Demo: Comments in HTML

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Comments in HTML</title>
</head>
<body>  
    <!-- This is a single line HTML comment -->
    <!-- This is an example of a
         HTML multi-line comment  -->
    <h1>This is a heading</h1>
    <p>This is a paragraph.</p>
</body>
</html>