We apologize for untranslated text, you can use the Google Translation button to get an automatic translation of the web page in the language of your choice.

Dev.Opera — Responsive Images: Use Cases and Documented Code Snippets to Get You Started

Finally, true responsive images are becoming a reality on the web — in pure HTML, without convoluted hacks. The <picture> element and a couple of new attributes for the <img> element are behing a flag in Chromium 37 (so coming soon in Opera), in Firefox Nightly and are being implemented in WebKit (although it remains to be seen if Apple will ship it in the next version of Safari).