Here you can insert article specific code for Head (before the </head>) and Footer (before the </body>) sections. They work in exactly the same way as site-wide code, which you can configure under Tools / Head & Footer Code.

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Example: <link rel="stylesheet" href="https://domain.com/path/to/style.css" type="text/css" media="all">

Example: <script type="text/javascript" src="http://domain.com/path/to/script.js"></script>