A step by step guide to deferring a comments widget until a visitor actually scrolls near it, using IntersectionObserver, a closure based load guard, and a real fetch backed render, verified with live browser tests.
JavaScript2- Page
Explore JavaScript tutorials, examples, concepts, and practical techniques for creating interactive and dynamic websites and web applications.
27Articles
A working javascript lightbox gallery with real proof: wraparound navigation, instant preloading, and accessible focus handling, no library needed.
A real comparison of infinite scroll vs pagination in JavaScript, with real Chromium proof of DOM growth, SEO tradeoffs, and working code for both.
A working javascript live search filter with real proof: substring matching, debounced input handling, and semantic highlighting, all tested live.
A working javascript ab testing script with real proof: deterministic hash bucketing, persistence that survives reloads, and GA4 conversion tracking.
See real browser proof of JavaScript web workers keeping a page responsive during heavy computation, plus the code to build one.
A practical fetch api vs axios comparison with real requests against a local server, showing how each one actually handles a failed response.
A practical look at the javascript event loop for SEO and marketing developers, with real timing captured to show why heavy tags block a page.
A hands on look at javascript debounce vs throttle, with a real debounce and throttle function built from scratch and their actual timing captured live.
A reading time calculator for blog posts uses one formula: word count divided by reading speed — 200-265 WPM depending on your source.
