I would approach this thinking in terms of a known aspect ratio of the images and use a technique like this: https://www.w3schools.com/howto/tryit.asp?filename

I would approach this thinking in terms of a known aspect ratio of the images and use a technique like this: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_aspect_ratio_43 https://www.w3schools.com/howto/tryit.asp?filename=tryhow_cs... Make no mistake, this is a silly problem to need to hack a solution for. So I would welcome lazy loaded images with space allocation before it's rendered with a responsive sizing.