📚 Table of Contents Introduction HTML Code CSS Code JavaScript Code Download Project FAQ 🌙 Dark Mode How to Build a Stopwatch App Using HTML, CSS & JavaScript In this advanced version, you get dark mode, floating TOC, syntax highlighting, download button, and full responsive layout. Perfect for professional Blogger coding tutorials. 📌 Introduction This stopwatch measures minutes, seconds, and milliseconds using JavaScript timers. Beginner-friendly and perfect for web development learners. 🧩 Step 1: HTML Code Copy Run <div class="stopwatch-container"> <h1>Stopwatch</h1> <div id="display">00:00:00</div> <div class="buttons"> <button id="start">Start</button> <button id="stop">Stop</button> <button id="reset">Reset</button> </div> </div> ...