Html comments 

This element is used to add a comment to an HTML document and paragraph. An HTML comment begins with <!–– and the comment closes with ––>.And  HTML comments are placed in between <!-- some text or code here --> tags. So, any content placed with-in <!-- some text or code here  --> tags will be treated as comment and will be completely ignored by the browser.

Example :-

<!DOCTYPE html>
<!-- Document Header Starts here --> 
    <title>Stack Overlode</title>
<!-- Document Header Ends here --> 
    <p>The Document content goes here.....</p> 

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