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I just can’t understand how add_image_size() and responsive images work.

So let’s say I have a thumbnail like 720×360.

So I’m assuming I need to add the size add_image_size('post-thumbnail', 720, 320, true) //hard crop

I upload image with the dimensions of 3000×2000 to accommodate for retina screens, etc.

Now I’m adding it to the page with the_post_thumbail('post-thumbnail') but it doesn’t build srcset at all!

If I’m using the_post_thumbail('full') it builds srcset but doesn’t preserve the aspect ratio.

So what I'm supposed to do now?

Do I need to add more sizes, starting from the largest? Like:

add_image_size('post-thumbnail', 3200, 1600, true); add_image_size('post-thumbnail-lg', 1600, 800, true); add_image_size('post-thumbnail-sm', 1200, 600, true); add_image_size('post-thumbnail-xs', 400, 200, true);

If not, how would I preserve the aspect ratio?

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function adjust_image_sizes_attr( $sizes, $size ) {
   $sizes = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px';
   return $sizes;
}
add_filter( 'wp_calculate_image_sizes', 'adjust_image_sizes_attr', 10 , 2 );

As outlined here: https://www.smashingmagazine.com/2015/12/responsive-images-in-wordpress-core/

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