<html>
<body>
<h3>A demonstration of how to access a DETAILS element</h3>
<details id="myDetails">
Some additional details...
</details>
<p>Click the "Try it" button to show additional details.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
const x = document.getElementById("myDetails");
x.open = true;
}
</script>
</body>
</html>