<!DOCTYPE html>
<html>
<head>
<style>
h1.hidden {
display: none;
}
</style>
</head>
<body>
<h1>This is a visible heading</h1>
<h1 class="hidden">This is a hidden heading</h1>
<p>Notice that the h1 element with display: none; does not take up any space.</p>
</body>
</html>