I am working on a project where I have to add external HTML files as a header and footer in the main (Index.html) page. I tried below script, but it didn't work
<!DOCTYPE html>
<html lang="en">
<head>
<title>sample test</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script>
$(document).ready(function(){
$('#header1').load("mainheader.html");
});
</script>
</head>
<body>
<div id="header1"></div>
</body>
</html>