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<html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no"> <title>RGB LED</title> <script src="/serial.js"></script> <link rel="stylesheet" href="/style.css"> </head> <body> <button id="connect">Connect</button> <div id="status"></div> <input type="range" min="0" max="255" value="0" id="red"/> <input type="range" min="0" max="255" value="0" id="green"/> <input type="range" min="0" max="255" value="0" id="blue"/> </body></html>