W3C Validation of SRCSET

Question

W3C Validator is throwing an error on the following code:

Answer 1

Please refer http://www.webkit.org/demos/srcset/ or https://ericportis.com/posts/2014/srcset-sizes/. Based on the w3c validator, if you specify width descriptor for one of the image candidate string, then you should use width descriptor for all of them.

Alternate option could be to use CSS media queries.