<picture>

gistfile1.txt

<picture>
    <source srcset="blog-10-wide@1x.webp 1x,
                    blog-10-wide@2x.webp 2x"
            media="(min-width: 600px)"
            type="image/webp">
    <source srcset="blog-10-wide@1x.png 1x,
                    blog-10-wide@2x.png 2x"
            media="(min-width: 600px)">
    <source srcset="blog-10-square@1x.webp 1x,
                    blog-10-square@2x.webp 2x"
            type="image/webp">
    <img src="blog-10-square@1x.png"
         srcset="blog-10-square@2x.png 2x"
         alt="Девушка пьёт кофе">    
</picture>