Foresight.js gives webpages the ability to tell if the user's device is capable of viewing high-resolution images (such as the 3rd generation iPad) before the image is requested from the server. Additionally, it judges if the user's device currently has a fast enough network connection for high-resolution images.
via github.com
Det här gillar jag. Genom att falla tillbaka på lågupplösta bilder är detta ett verktyg med enorm potential.