Pinpointing Performance Bottlenecks with Chrome DevTools

i built and published another Chrome extension. here's the story of why. it started with frustration. i was debugging a UI one evening — hovering over elements, opening DevTools, switching tabs, hunting for the right CSS class, copy-pasting, losing track. over and over. it sounds small. but if you've done frontend work, you know that moment where you think — there has to be a better way. so i stopped debugging that night and started building instead. the idea was simple: what if you could just hover over any element on a page and instantly see its CSS classes, styles, and computed values — without ever touching DevTools? that became CSS Class Highlighter. you turn on Inspect Mode, hover anything, and boom — tag, id, classes, colors, computed styles. all right there. you can highlight every element using the same class, copy the selector in one click, even export the full class list as JSON. it took me way longer than i expected. permissions, content scripts, chrome sync, making sure it worked across all kinds of websites without breaking anything — the edge cases were endless. but i kept going because i genuinely wanted this tool to exist. and then one day i submitted it to the Chrome Web Store. then waited. then got approved. seeing it live — with a real URL, a real install button, version 3.2.8 shipped — felt just as good as the first time. it's a small tool. 13 users right now. no big launch, no viral moment. but i built something real, solved a real problem, and shipped it. if you're a frontend dev, designer, or QA who's tired of digging through DevTools just to find a class name — this is for you. 👇 link in the comments #buildinpublic #chromeextension #frontenddevelopment #CSS #webdev #sideproject #shipped #developertools #javascript

Stop using onclick on div tags. You are calling it a button, but is it? 🛑 We’ve all seen it: <div onclick={handleClick}>Click Me</div>. It’s easy, it’s quick, and it works... right? Wrong. By doing this, you are unintentionally locking out millions of users from your website. When you use a div as a button, you are killing Accessibility (A11y). Here is why a real <button> tag (or proper ARIA roles) is a non-negotiable in 2026: 1️⃣ Keyboard Navigation: A real button is focusable by default. A div is not. Try navigating your site using only the Tab key—your "div-buttons" will be invisible to keyboard users. 2️⃣ Screen Reader Support: Screen readers tell users "Button" when they encounter a <button>. For a div, it just says "Text," leaving visually impaired users confused about what’s interactive. 3️⃣ Built-in Behavior: Buttons support the Enter and Space keys automatically. With a div, you have to manually write extra code to handle those keypresses. The "Professional" Fix: If you must use something other than a button tag, don't forget the A11y essentials: ✅ role="button": Tells the browser what the element does. ✅ tabindex="0": Makes it reachable via keyboard. ✅ aria-label: Provides a clear description for screen readers. My Take: In a world where we focus so much on performance and SEO, let’s not forget Inclusion. A truly Great Developer builds for everyone, not just for people who use a mouse. Are you still using div for buttons, or have you made the switch to Semantic HTML? Let's discuss below! 👇 #WebAccessibility #A11y #HTML5 #FrontendDevelopment #SoftwareEngineering #InclusiveDesign #WebStandard #ReactJS #NextJS #CleanCode #CodingTips #UXDesign #WebDev2026

Ever had that annoying "flicker" in your React app where a component jumps or shifts right after it loads? It’s a classic useEffect vs. useLayoutEffect battle. Most devs reach for the wrong one and end up with either a glitchy UI or, worse, an infinite render loop that crashes the browser tab. I just broke down exactly how to master the timing of React’s layout phase to keep your UI butter-smooth. 💡 Key takeaway: If the user sees it, useLayoutEffect might be your best friend. If it's data-fetching, stay away. Read the full breakdown here: #ReactJS #WebDevelopment #Frontend #CodingTips #JavaScript

𝐇𝐨𝐰 𝐭𝐨 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐞 𝐑𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐢𝐧 𝐭𝐡𝐞 𝐁𝐫𝐨𝐰𝐬𝐞𝐫 🚀 Many developers focus on 𝐀𝐏𝐈 𝐬𝐩𝐞𝐞𝐝 𝐨𝐫 𝐛𝐚𝐜𝐤𝐞𝐧𝐝 𝐨𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧, but forget one important thing — 𝐡𝐨𝐰 𝐟𝐚𝐬𝐭 𝐭𝐡𝐞 𝐛𝐫𝐨𝐰𝐬𝐞𝐫 𝐫𝐞𝐧𝐝𝐞𝐫𝐬 𝐭𝐡𝐞 𝐔𝐈. Even with a fast backend, poor rendering can make your app feel slow and laggy. 𝐇𝐞𝐫𝐞 𝐚𝐫𝐞 𝐬𝐨𝐦𝐞 𝐩𝐫𝐚𝐜𝐭𝐢𝐜𝐚𝐥 𝐰𝐚𝐲𝐬 𝐭𝐨 𝐨𝐩𝐭𝐢𝐦𝐢𝐳𝐞 𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠 𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞: 🔹 𝟏. 𝐑𝐞𝐝𝐮𝐜𝐞 𝐃𝐎𝐌 𝐒𝐢𝐳𝐞 A large and deeply nested DOM increases the browser’s rendering work. Keep your HTML structure clean and minimal. 🔹 𝟐. 𝐀𝐯𝐨𝐢𝐝 𝐋𝐚𝐲𝐨𝐮𝐭 𝐓𝐡𝐫𝐚𝐬𝐡𝐢𝐧𝐠 Frequent DOM reads and writes force the browser to recalculate layout multiple times, which slows down rendering. 🔹 𝟑. 𝐔𝐬𝐞 𝐭𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦 𝐚𝐧𝐝 𝐨𝐩𝐚𝐜𝐢𝐭𝐲 𝐟𝐨𝐫 𝐀𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐬 Properties like top, left, width, and height trigger layout recalculations. Instead, use transform and opacity, which are often GPU accelerated. 🔹 𝟒. 𝐋𝐚𝐳𝐲 𝐋𝐨𝐚𝐝 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 Load images and components only when needed. Example: <𝐢𝐦𝐠 𝐥𝐨𝐚𝐝𝐢𝐧𝐠="𝐥𝐚𝐳𝐲" /> 🔹 𝟓. 𝐌𝐢𝐧𝐢𝐦𝐢𝐳𝐞 𝐑𝐞𝐟𝐥𝐨𝐰𝐬 𝐚𝐧𝐝 𝐑𝐞𝐩𝐚𝐢𝐧𝐭𝐬 Frequent UI changes can trigger expensive browser operations. Batch DOM updates when possible. 🔹 𝟔. 𝐔𝐬𝐞 𝐫𝐞𝐪𝐮𝐞𝐬𝐭𝐀𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐅𝐫𝐚𝐦𝐞 𝐟𝐨𝐫 𝐀𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐬 It synchronizes animations with the browser’s rendering cycle for smoother performance. 🔹 𝟕. 𝐕𝐢𝐫𝐭𝐮𝐚𝐥𝐢𝐳𝐞 𝐋𝐚𝐫𝐠𝐞 𝐋𝐢𝐬𝐭𝐬 If you render thousands of items in the DOM, the browser will struggle. Use list virtualization to render only visible elements. 💡 𝐒𝐢𝐦𝐩𝐥𝐞 𝐑𝐮𝐥𝐞: 𝐋𝐞𝐬𝐬 𝐃𝐎𝐌 + 𝐟𝐞𝐰𝐞𝐫 𝐥𝐚𝐲𝐨𝐮𝐭 𝐜𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 + 𝐆𝐏𝐔-𝐟𝐫𝐢𝐞𝐧𝐝𝐥𝐲 𝐚𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐬 = 𝐅𝐚𝐬𝐭𝐞𝐫 𝐔𝐈.⚡ Small optimizations in rendering can significantly improve user experience and Core Web Vitals. #WebPerformance #FrontendDevelopment #JavaScript #ReactJS #PerformanceOptimization #CoreWebVitals #shohelranabaig #codewithbaig

𝗚𝗼𝗼𝗴𝗹𝗲 𝗿𝗲𝗺𝗼𝘃𝗲𝗱 𝘁𝗵𝗲 𝗔𝗰𝗰𝗲𝘀𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝘆 𝗮𝘂𝗱𝗶𝘁 𝗳𝗿𝗼𝗺 𝗟𝗶𝗴𝗵𝘁𝗵𝗼𝘂𝘀𝗲. 🚨 I’ve heard this rumor circulating lately, so let's set the record straight: It is 100% false. Chrome DevTools is updating and restructuring some Performance panels, but the 𝗔𝗰𝗰𝗲𝘀𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝘆 𝗮𝘂𝗱𝗶𝘁 (𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗯𝘆 𝗮𝘅𝗲-𝗰𝗼𝗿𝗲) 𝗶𝘀 𝗳𝘂𝗹𝗹𝘆 𝗶𝗻𝘁𝗮𝗰𝘁 and isn't going anywhere. However, this rumor brings up a much 𝗯𝗶𝗴𝗴𝗲𝗿 𝗶𝘀𝘀𝘂𝗲 I see in frontend development: Relying entirely on a 100/100 Lighthouse score to call your app "𝗮𝗰𝗰𝗲𝘀𝘀𝗶𝗯𝗹𝗲." When building complex, highly dynamic UIs in React or optimizing routing in Next.js, an automated tool is just the starting line. Automated tools like Lighthouse are fantastic for catching the basics: ✅ Missing alt tags ✅ Poor color contrast ratios ✅ Basic ARIA attribute syntax errors But here is what a 100/100 score cannot catch: ❌ Logical focus management when a custom modal opens and closes ❌ How dynamic DOM injections are actually announced to a screen reader ❌ Whether a complex widget is actually usable, or just a trap, for keyboard-only navigation 𝗔 𝗽𝗲𝗿𝗳𝗲𝗰𝘁 𝗟𝗶𝗴𝗵𝘁𝗵𝗼𝘂𝘀𝗲 𝘀𝗰𝗼𝗿𝗲 𝗺𝗲𝗮𝗻𝘀 𝘆𝗼𝘂𝗿 𝗰𝗼𝗱𝗲 𝗶𝘀 𝘀𝘆𝗻𝘁𝗮𝗰𝘁𝗶𝗰𝗮𝗹𝗹𝘆 𝗮𝗰𝗰𝗲𝘀𝘀𝗶𝗯𝗹𝗲. 𝗜𝘁 𝗱𝗼𝗲𝘀 𝗻𝗼𝘁 𝗺𝗲𝗮𝗻 𝗶𝘁 𝗶𝘀 𝗵𝘂𝗺𝗮𝗻𝗹𝘆 𝗮𝗰𝗰𝗲𝘀𝘀𝗶𝗯𝗹𝗲. True web accessibility (a11y) requires empathy, manual testing, and actually navigating the experiences we build without a mouse. How does your team handle manual a11y testing in your workflow? Do you test with screen readers, or rely mostly on automated pipelines? Let’s discuss below! 👇 #FrontendDevelopment #WebAccessibility #ChromeDevTools #ReactJS #NextJS #WebDev

The default behaviour of a JavaScript bundler is: put everything in one file. The default behaviour of a user is: only visit one part of your app at a time. Lazy loading bridges the gap between these two realities. What to lazy load: → Components that are not visible on initial render → Heavy third-party libraries used only in specific sections → Routes that users may never visit in a session → Modals, drawers, and overlays (they're hidden until triggered) What NOT to lazy load: → Navigation and layout components (needed on every render) → Content above the fold (lazy loading it creates visible delay) → Error boundaries (need to be ready before errors occur) For instance, a user who visits the dashboard never downloads the settings module. Or a user who never opens the editor never downloads the rich text library. Everyone gets exactly the code they need for their current journey. Lazy loading is not an optimisation. It is the correct default that eager loading overrides. What's the heaviest component you've successfully lazy loaded? #performance #WebOptimisation #web #react #next

🤦♀️ 𝐀 𝐒𝐦𝐚𝐥𝐥 𝐂𝐒𝐒 𝐇𝐚𝐜𝐤 𝐂𝐚𝐮𝐬𝐞𝐝 𝐚 𝐁𝐢𝐠 𝐔𝐈 𝐁𝐮𝐠… Yesterday I spent almost 30 minutes debugging something that made no sense. I clicked on a Clock component ⏰ in my React UI and somehow it was changing the website theme 🌙☀️. At first I thought: Maybe the click event is bubbling 🤔 Maybe the Clock component has some hidden handler Maybe React state is behaving weirdly But none of those were the problem. Then I opened Chrome DevTools and inspected the elements. And there it was… 👀 The theme toggle button was invisibly overlapping the clock. Why? Because of negative margins. <𝘐𝘤𝘰𝘯𝘉𝘶𝘵𝘵𝘰𝘯 𝘰𝘯𝘊𝘭𝘪𝘤𝘬={() => 𝘵𝘰𝘨𝘨𝘭𝘦𝘋𝘢𝘳𝘬𝘛𝘩𝘦𝘮𝘦("𝘵𝘩𝘦𝘮𝘦", "")}>  <𝘍𝘰𝘯𝘵𝘈𝘸𝘦𝘴𝘰𝘮𝘦𝘐𝘤𝘰𝘯 𝘴𝘵𝘺𝘭𝘦={{ 𝘮𝘢𝘳𝘨𝘪𝘯𝘓𝘦𝘧𝘵: "-130𝘱𝘹" }} /> </𝘐𝘤𝘰𝘯𝘉𝘶𝘵𝘵𝘰𝘯> <𝘥𝘪𝘷 𝘴𝘵𝘺𝘭𝘦={{ 𝘮𝘢𝘳𝘨𝘪𝘯𝘓𝘦𝘧𝘵: "-60𝘱𝘹" }}>  <𝘊𝘭𝘰𝘤𝘬 /> </𝘥𝘪𝘷> The button was pushed 130px to the left, extending its clickable area. So whenever I clicked the clock, I was actually clicking the IconButton sitting on top of it. ⚠️ Invisible UI overlaps are one of the trickiest frontend bugs. Instead of using layout hacks, I fixed it using Flexbox: <𝘎𝘳𝘪𝘥 𝘪𝘵𝘦𝘮 𝘴𝘵𝘺𝘭𝘦={{ 𝘥𝘪𝘴𝘱𝘭𝘢𝘺: "𝘧𝘭𝘦𝘹", 𝘢𝘭𝘪𝘨𝘯𝘐𝘵𝘦𝘮𝘴: "𝘤𝘦𝘯𝘵𝘦𝘳", 𝘨𝘢𝘱: "10𝘱𝘹" }}> <𝘐𝘤𝘰𝘯𝘉𝘶𝘵𝘵𝘰𝘯 𝘰𝘯𝘊𝘭𝘪𝘤𝘬={() => 𝘵𝘰𝘨𝘨𝘭𝘦𝘋𝘢𝘳𝘬𝘛𝘩𝘦𝘮𝘦("𝘵𝘩𝘦𝘮𝘦", "")}> <𝘍𝘰𝘯𝘵𝘈𝘸𝘦𝘴𝘰𝘮𝘦𝘐𝘤𝘰𝘯 /> </𝘐𝘤𝘰𝘯𝘉𝘶𝘵𝘵𝘰𝘯>  <𝘊𝘭𝘰𝘤𝘬 />  </𝘎𝘳𝘪𝘥> ✔ Removed negative margins ✔ Used display: flex for layout ✔ Added gap for spacing ✔ No more overlapping click areas ✨ Lesson learned: Modern CSS (Flexbox/Grid) is far more reliable than using negative margins for layout. Sometimes the bug isn’t in your JavaScript logic… It’s hiding in your CSS layout. Have you ever faced a bug where the UI looked correct but behaved completely wrong? #FrontendDevelopment #ReactJS #CSS #Debugging #WebDevelopment #Programming

#Hello_Connections #Day32 of #100DaysOfCode Built an Advanced Image Slider using Bootstrap 5 Features: Fully responsive carousel Multiple slides with smooth transitions Dark overlay for better text visibility Text + buttons on each slide Indicators and navigation controls This component can be used in landing pages, portfolios, or modern website UI. Continuing to improve my frontend skills step by step Code Of School Avinash Gour & Ritendra Gour #HTML #CSS #Bootstrap #WebDevelopment #Frontend #LearningJourney

Component libraries are a trap. Don't get me wrong, they let you move fast initially. But 6 months down the line, when you need a highly specific custom component, you end up fighting the library's internal CSS overrides and bloating your bundle size. For our frontend, we took a different approach. We used shadcn/ui alongside Tailwind CSS. It’s not a library you install; it’s a collection of reusable components you copy and paste into your apps. ✅ We own the code. ✅ Fully accessible out of the box. ✅ Zero bloat. We built a premium, glassmorphism-inspired UI tailored exactly to our design needs, without hacking through third-party source code. Own your UI layer. Your future self will thank you. #Frontend #UIUX #WebDesign #Reactjs #TailwindCSS #ShadcnUI

🚀 Day 19 of My 30 Days Web Development Challenge Consistency check ✅ — showing up every day and building real projects. Today I built a 🎯 Guess The Number Game using HTML, CSS & JavaScript It may look simple, but this project helped me improve how I think about logic, user interaction, and UI structure. ✨ Features: ▶️ Random number generation 🎚️ Difficulty levels (Easy / Medium / Hard) 💬 Smart hints (Too High / Too Low / Close) 📊 Attempts counter 🏆 Best score tracking using localStorage 🔄 Restart game 🌗 Dark / Light mode toggle 📱 Clean & responsive UI 💡 What I learned: • Writing better conditional logic • Handling real-time user input • Using localStorage in projects • Structuring UI in a clean and readable way • Making simple ideas more interactive 🔗 Live Demo: https://lnkd.in/g49B4vU3 💻 GitHub: https://lnkd.in/gQVjh7Sq Still learning. Still building. Still improving. 🔥 #WebDevelopment #JavaScript #FrontendDevelopment #FrontendDeveloper #CodingJourney #BuildInPublic #100DaysOfCode #HTML #CSS #WebDevProjects #LearnInPublic #Consistency #DeveloperLife