SlothyLoader is a responsive and retina-aware lazy loader.

This is a fork of LaziestLoader by Josh Williams, with the main difference that SlothyLoader doesn't depend on jQuery. Everything else, from necessary markup to features, should be the same. "Should", because it isn't thoroughly tested yet.

Documentation and examples at http://www.bizweekgraphics.com/slothy-loader/

As of March 6, 2019, slothyLoader uses the Intersection Observer API.