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HTML Responsive Images Image Delivery with Srcset and Sizes Adding Sizes

Posted by Hakim Rachidi
Hakim Rachidi
38,489 Points

Sizes and srcset

How does the srcset in conjuction with the sizes attribute pick the right picture. If I have this image:

sizes="(min-width: 1024px) 512px,
                  100vw"
srcset="img/banner-large.jpg 2048w,
                  img/banner-medium.jpg 1400w,
                  img/banner-small.jpg 800w"

I thought that the last picture would always be chosen (800w), because of the 512px (sizes) and the small image 800w, but it did not always? Why?