I use <img>.
You won’t see any 2x when using <img>.
??? How does the browser know about the 2x images?
My sourcecode output looks like:
<img sizes="
(max-width: 494px) 478px,
(max-width: 646px) 630px,
(max-width: 767px) 740px,
(max-width: 1018px) 478px,
(max-width: 1199px) 630px,
740px"
srcset="
FlashAir-III_Retina-Voll-478x285.jpg 478w,
FlashAir-III_Retina-Voll-630x375.jpg 630w,
FlashAir-III_Retina-Voll-740x440.jpg 740w"
src="FlashAir-III_Retina-Voll-740x440.jpg">
But there should be the 2x files in the srcset?
Any proposals?