Webkit just added support for the new
srcset attribute. From the Webkit blog:
WebKit now supports the
srcsetattribute 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.
Although it will be a while before this is usable across a broad spectrum of browsers, it’s progress in a good direction.