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<html lang="en"> <head> <meta charset="utf-8" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.js"></script> <link rel="stylesheet" type="text/css" href="style.css"> </head> <body> <p> Material <input id="material" type="color" value="#77ff99"> <select> <option>Ambient</option> <option>Directional</option> <option>Point</option> <option>Spot</option> </select> Light <input id="light" type="color" value="#ffffff"> </p> <script src="sketch.js"></script></body></html>