jQuery fallback on local file if cdn not available
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script>window.jQuery || document.write('<script src="jquery-3.3.1.js">\x3C/script>')</script>
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script>window.jQuery || document.write('<script src="jquery-3.3.1.js">\x3C/script>')</script>
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