This article is a written version of the Stefan Judis talk “HTTP headers for the responsible developer” given at JavaScript fwdays'19, a conference for JavaScript developers .

LazyLoad is a fast, lightweight and flexible script that speeds up your web application by loading images, video or iframes as they enter the viewport. It’s written in plain “vanilla” JavaScript, uses Intersection Observers, and supports responsive images. It’s also SEO-friendly and it has some other notable features.

Learn how to compare two dates in JavaScript with various methods by Saruque Ahamed Mollick.