HTML important Comments

<!DOCTYPE html>
<html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <h1>Header 1.</h1>
        <h2>Header 2.</h2>
        <h3>Header 3.</h3>
        <h4>Header 4.</h4>
        <h5>Header 5.</h5>
        <h6>Header 6.</h6>
        <p>Paragraph</p>
        <a href="https://google.com">Use Google you Bing plebeians.</a>
        <img src="http://i.imgur.com/vFJgJKf.jpg" />
        <!--This is a comment that the computer won't print out.-->
    </body>
</html>

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