<!DOCTYPE html>
<html>
<body>
<p>Click the button to get the text of the third child element (index 2) of the select element.</p>
<select id="mySelect" size="4">
<option>Audi</option>
<option>BMW</option>
<option>Saab</option>
<option>Volvo</option>
</select>
<br><br>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var c = document.getElementById("mySelect").children;
document.getElementById("demo").innerHTML = c[2].text;
}
</script>
</body>
</html>