Nearly three years after the initial request for a native responsive images solution in HTML, <picture>, srcset and sizes finally are officially a web standard.

Both, WHATWG and W3C landed patches in the past week including the <picture> element and its attributes to the HTML5 specification.

And here are the specifications for each on WHATWG and W3C sites:

• WHATWG <picture>
• WHATWG srcset
• WHATWG sizes
• W3C <picture>
• W3C srcset
• W3C sizes

This is the official part, the living standard is always to be found at picture.responsiveimages.org to which you can submit bugs and issues on GitHub via RICG.

This is a good point to say thank you to all who are involved into Responsive Images work. Special thanks goes to:

• Mathew Marquis, the chairman
• Marcos Cacares, the one who fought for it in the webstandard consortiums
• Yoav Weiss, the one who made all possible (technically, implementation-wise)
• Geri Coady, who did the design work
• Simon Pieters, Tab Atkins, Matthew Wilcox, Bruce Lawson, Eric Portis, John Schoenick, Robin Berjon, Adam Bradley, Jason Grigsby, Scott Jehl, Kornel Lesinski, David Newton, and a whole lot more people who are all awesome!