TL;DR multiple classes is ok, but restrict yourself to a single modifier class and a single state class or state data attribute per element:
Responsive Images: Use Cases and Documented Code Snippets to Get You Started IntroductionFinally, 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 behind a flag in Chromium 37 and shipping in Chromium 38 (so coming soon in Opera), in Firefox Nightly and are being impleme
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