Blink includes support srcset

Support for attribute srcset for the tag will be included by default in the engine Blink.

Support for attribute srcset for tag <img> from the working draft of HTML5 will be enabled by default engine Blink and will be available starting from versions of Chrome 34  Opera 21. Attribute lets you specify a list of alternative resources, which are uploaded in depending on the conditions insert the image. Support srcset a nightly builds of WebKit in last year (to still is enabled by the default) and in the list of priorities for Firefox, along with element <picture>.

what is A Blink?

Blink - free engine for displaying web pages, designed by the American company Google Inc. & Opera Software code-based web core of WebKit browser Chromium