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For example, you can use the following code for loading the jQuery library from Google CDN:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

or the following one for loading the Bootstrap library from MaxCDN:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

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<meta name="google-site-verification" content="9YIxbDD1AoVABuONElrAfontoipMN1I9hWk71fzaA5Y" />