Lazy Loading Images (Intersection Observer)

Lazy loading defers the loading of images until they are about to enter the viewport, improving page load times and reducing bandwidth usage. This demo uses the native loading="lazy" attribute on an <img> tag, which leverages the browser’s built-in Intersection Observer API for automatic lazy loading without custom JavaScript. Lazy loading is ubiquitous on the web, seen in image-heavy sites like e-commerce, galleries, and social media, where it enhances performance by loading content on demand. It’s essential for mobile users and slow connections, preventing unnecessary data transfer.

Browser State Change Detector

I developed a JavaScript utility to detect and log browser state changes using Page Visibility API and lifecycle events. It tracks states like active, passive, hidden, frozen, and terminated, logging transitions for analytics or debugging. Useful for optimizing performance, user engagement, and resource management in web apps.