Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<h3>A demonstration of how to access a LI element</h3>

<ol>
  <li id="myLi">Coffee</li>
  <li>Tea</li>
  <li>Milk</li>
  <li>Water</li>
</ol>

<p>Click the button to set the list items to increment from the number "300" instead of "1".</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var x = document.getElementById("myLi");
    x.value = "300";
}
</script>

</body>
</html>