scottjehl/picturefill — pull request #300 by zcorpan (2014-08-12 09:07:58+00:00)
Title: Properly check for sizes support

`w.HTMLImageElement.sizes` is bogus -- there's no sizes property on the interface object. Per spec, it should be on the prototype, but that's not widely implemented yet (in some browsers it would go on the instance instead).