Solid is a purely reactive library. It was designed from the ground up with a reactive core. It's influenced by reactive principles developed by previous libraries.

A declarative, efficient and flexible JavaScript library for building user interfaces.

Sitespeed.io is a set of Open Source tools that makes it easy to monitor and measure the performance of your web site.

Yet another Lazy Loading JavaScript library, why?<br><br>Existing lazy loading libraries hook up to the scroll event or use a periodic timer and call getBoundingClientRect() on elements that need to be lazy loaded. This approach, however, is painfully slow as each call to getBoundingClientRect() forces the browser to re-layout the entire page and will introduce considerable jank to your website.<br><br>Making this more efficient and performant is what IntersectionObserver is designed for, and it’s landed in Chrome 51. IntersectionObservers let you know when an observed element enters or exits the browser’s viewport.