A small example of the how to apply progressive image loading and some strategies currently used on web apps for that.
Original post on Medium: Progressive Image Loading and IntersectionObserver
Check it here: progressive-image-loading.surge.sh

This project depends in a GO lib, called primitive. Before running the yarn pre-build you need to install primitive.

First run yarn install to install the dependencies and then, run yarn pre-build to generate the image placeholders and finnally yarn start to run the webpack-dev-server.

Ramphastos toco TOCO TOUCAN by Dr. Nasser Halaweh - Picture under creative commons license

This project is under the MIT license