cannot read property of null javascript dom code example

Example: Cannot Read Property Of null in JavaSript

<DOCTYPE html>
<html lang="en-us">
  <head>
    <title>Answer</title>
    <!-- WRONG WAY -->
    <!--
 	Because JavaScript Execute Line By Line
	-->
    <script src="javascript.js"></script>
  </head>
    <body>
      Hello, World!
    </body>
  	<script src="javascript.js"></script>
</html>

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