<!DOCTYPE html>
<html>
<body>
Select your favorite fruit:
<select id="mySelect">
<option>Apple</option>
<option>Orange</option>
<option selected>Pineapple</option>
<option>Banana</option>
</select>
<br>
<button type="button" onclick="myFunction()">Is selected fruit selected by default?</button>
<script>
function myFunction() {
var x = document.getElementById("mySelect").selectedIndex;
var y = document.getElementsByTagName("option");
alert("Is " + y[x].text + " selected by default? " + y[x].defaultSelected);
}
</script>
</body>
</html>