27551 2014-12-10 03:42:59 +0000 fallback for user agents don't support image-set 2015-09-16 12:44:19 +0000 1 1 1 Unclassified WHATWG HTML unspecified Other other RESOLVED NEEDSINFO https://html.spec.whatwg.org/#toc-semantics P3 normal Unsorted 1 contributor zcorpan ian mike zcorpan oldest_to_newest 116087 0 contributor 2014-12-10 03:42:59 +0000 Specification: https://html.spec.whatwg.org/multipage/semantics.html Multipage: https://html.spec.whatwg.org/multipage/#toc-semantics Complete: https://html.spec.whatwg.org/#toc-semantics Referrer: https://html.spec.whatwg.org/multipage/embedded-content.html Comment: fallback for user agents don't support image-set Posted from: 125.70.57.17 User agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36 116089 1 zcorpan 2014-12-10 10:56:51 +0000 Can you elaborate? image-set is a CSS feature. You can provide a fallback by using the relevant property twice, as in: background-image:url(...); background-image:image-set(...); HTML has <img srcset src> where src is the fallback.