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Got it, you're looking to create an edutech app with features like video lectures, recordings, and online chat. Here's a simplified example of how you might structure the code for these features using a combination of HTML, CSS, and JavaScript for the front end, and Node.js for the back end. Please note that this is a basic outline and a real app would require more comprehensive code and additional technologies. 1. **Front-end (HTML/CSS/JavaScript):** ```html <!DOCTYPE html> <html> <head> <title>EduTech App</title> <link rel="stylesheet" type="text/css" href="styles.css"> </head> <body> <div class="video-container"> <video id="lecture-video" controls> <source src="lecture.mp4" type="video/mp4"> Your browser does not support the video tag. </video> </div> <div class="chat-container"> <div id="chat-messages"></div> <input type="text" id="chat-input" placeholder="Enter your message..."> <button id="send-button">Send</button> </div> <script src="app.js"></script> </body> </html> ``` 2. **CSS (styles.css):** ```css .video-container { width: 70%; margin: 0 auto; } .chat-container { width: 30%; margin: 0 auto; } ``` 3. **JavaScript (app.js):** ```javascript const chatMessages = document.getElementById("chat-messages"); const chatInput = document.getElementById("chat-input"); const sendButton = document.getElementById("send-button"); const lectureVideo = document.getElementById("lecture-video"); // Simulated chat functionality sendButton.addEventListener("click", () => { const message = chatInput.value; if (message !== "") { const newMessage = document.createElement("div"); newMessage.textContent = message; chatMessages.appendChild(newMessage); chatInput.value = ""; } }); // Simulated video playback lectureVideo.addEventListener("play", () => { console.log("Video started playing."); }); ``` 4. **Back-end (Node.js - server.js):** ```javascript const express = require("express"); const app = express(); const http = require("http").createServer(app); const io = require("socket.io")(http); app.use(express.static(__dirname)); io.on("connection", (socket) => { console.log("A user connected."); socket.on("chat message", (msg) => { io.emit("chat message", msg); }); }); http.listen(3000, () => { console.log("Server listening on port 3000"); }); ```