If the devide cuts the mustard, add some custard! Write from CDN, or local if that fails (after 1s)

cdnornot.js

<script type="text/javascript">
// Mustard Cutting
if ('querySelector' in document && 'addEventListener' in window) {
	var windowWidth = document.body.clientWidth;
	if(windowWidth > 768){

		// add class to HTML tag
		(function(H){H.className=H.className.replace(/\bno-js\b/,'js')})(document.documentElement);

		// load scripts - from cdn but with a fallback
		document.write(unescape("%3Cscript src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.0/TweenMax.min.js' type='text/javascript'%3E%3C/script%3E"));
		document.write(unescape("%3Cscript src='https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/ScrollMagic.min.js' type='text/javascript'%3E%3C/script%3E"));
		setTimeout(function() {
			if (typeof TweenMax == 'undefined') {
				document.write(unescape("%3Cscript src='../assets/js/gsap-tweenmax.min.js' type='text/javascript'%3E%3C/script%3E"));
			}
			if (typeof ScrollMagic == 'undefined') {
				document.write(unescape("%3Cscript src='../assets/js/scrollmagic.min.js' type='text/javascript'%3E%3C/script%3E"));
			}
		}, 
		// timeout delay
		1000
		);
	</script>
	<script type="text/javascript">
		// local scripts
		document.write(unescape("%3Cscript src='../assets/js/ech-noncritical.min.js' type='text/javascript' defer%3E%3C/script%3E"));
		}
};
</script>