Original Link: https://www.webkit.org/blog/2910/improved-support-for-high-resolution-displays-with-the-srcset-image-attribute/

Dean Jackson, WebKit:

WebKit now supports the srcset attribute on image (img) elements (official specification from the W3C). This allows you, the developer, to specify higher-quality images for your users who have high-resolution displays, without penalizing the users who don’t. Importantly, it also provides a graceful fallback for browsers that don’t yet support the feature.