​x
 
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hide Element</title>
</head>
<body>
​
<h1 id="hideMe" style="display: block;">Hide Me!</h1>
​
<button onclick="hideElement()">Click to Hide</button>
​
<script>
function hideElement() {
    var element = document.getElementById("hideMe");
    element.style.display = "none";
}
</script>
​
</body>
</html>