Question

By first line of Javascript I meant the JS code inside tags with no “src” attribute.

Answer 1

By right it will be evaluated top down.

Read more about it from my previous answer: Load and execution sequence of a web page?

Let me explain here:

<script type="text/javascript">
  alert(jQuery); // alerts jQuery's namespace
</script>
<script type="text/javascript" src="jquery.js"></script>

The result is alerting undefined.

<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
  alert(jQuery); // alerts jQuery's namespace
</script>

The result is alerting a object/function where defined.