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<h1>Functional URLs</h1>

This example illustrates various options for specifying a track url
<ul>
    <li>A string
        <pre>url: "https://www.encodeproject.org/files/ENCFF563PAW/@@download/ENCFF563PAW.bigWig"</pre>
    </li>
    <li>A function
        <pre>url: function () {return "https://www.e