Mark script element as defer
Description
defer attribute on a <script> element
tells browser that download should begin immediately but execution should be
deferred:
Example
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" defer src="example1.js"></script>
<script type="text/javascript" defer src="example2.js"></script>
</head>
<body>
<!-- content here -->
</body>
</html>
Note
The defer attribute is supported only for external script files.
For XHTML documents, specify the async attribute as defer="defer".