when does javascript run in html code example

Example 1: how to use javascript in html

<!-- include an external javascript document -->
<script src="myJavaScript.js" charset="utf-8"></script>

<!-- JavaScript inside html element -->
<script>
  console.log("This is JavaScript");
</script>

Example 2: how to add javascript in html

<script src="script.js"></script>

Example 3: how to use script tag

<script>
 document.getElementById("id").innerText = ("");
</script>