<!DOCTYPE html>
<html>
<title>W3.JS</title>
<script src="https://www.w3schools.com/lib/w3.js"></script>
<body>
<div w3-include-html="h1.html"></div>
<div w3-include-html="content.html"></div>
<script>
w3.includeHTML();
</script>
</body>
</html>