Browser

A complete, practical guide to understanding real-time communication on the web with examples, pros, cons, and use cases. Introduction We live in a real-time world, live chats, notifications, dashboards, and multiplayer apps all expect instant updates. Traditional HTTP requests are one-way: the client asks, the server responds, and the connection ends. That’s fine for static pages,…

Both can make your app real-time, but sometimes, simpler is smarter. Introduction If you’ve ever built a real-time app, a chat, a dashboard, a notification system, or a live tracker, you’ve probably faced this question: “Should I use WebSockets or Server-Sent Events (SSE)?” Most developers immediately reach for WebSockets because they sound cooler: “real-time,” “bi-directional,” “persistent…

Learn how to make multiple tabs talk to each other, no backend, no frameworks, just pure JavaScript. Introduction Open your app in two browser tabs, make a change in one, and the other still shows old data, frustrating, right? Whether it’s dark mode toggles, logout events, or live cart updates, browser tabs don’t share state…

Keep multiple tabs instantly in sync, no server, no frameworks, just pure JavaScript magic. Introduction Ever opened your app in two browser tabs, updated something in one tab, and then wondered why the other one didn’t update too? Whether it’s user preferences, dark mode settings, logout status, or shopping cart data, keeping multiple tabs in…

It’s 2025, stop manually calculating scroll positions. The browser can handle visibility detection for you automatically. Introduction If you’ve ever built “lazy loading,” “infinite scrolling,” or “animate on scroll” features,you’ve probably written something like this: window.addEventListener(“scroll”, () => { const rect = el.getBoundingClientRect(); if (rect.top < window.innerHeight) loadImage();}); It works… but it’s not pretty. Every…

Ditch manual scroll listeners. Here’s how to load images, data, and components only when they enter the viewport. Introduction You know that feeling when a website loads instantly as you scroll, images fade in smoothly, data appears right when you need it, and everything feels effortless? That’s not luck. That’s the Intersection Observer API doing…

From copy buttons to formatted data sharing, here’s how to master the modern Clipboard API and ditch your old textarea hacks. Introduction We’ve all written the same messy snippet before: document.execCommand(“copy”); It worked, but it was a relic of the past. Today, the Clipboard API gives you a clean, async, and secure way to read…

Stop using hidden textareas. Here’s the modern way to copy content with just one line of JavaScript. Introduction We’ve all built a “Copy” button at some point. You know the old way to create a hidden <textarea>, select its text, and call document.execCommand(‘copy’). It worked… but it felt like duct tape. Modern browsers now have a…