Is it true that first line of Javascript will be executed only after all script tags with src attribute are downloaded and evaluated?

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: http://stackoverflow.com/questions/1795438/load-and-execution-sequence-of-a-web-page/1795502#1795502

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.

Answer 2

The scripts are executed in the order they are listed in the html. It does not matter if they are inline JavaScript (within <script> tags) or if loaded as external scripts (<script src="xx.js">).