Ref: https://github.com/twbs/bootstrap/pull/28072
It looks like the img-retina() mixin has been deprecated with the suggestion that we should use responsive image tags (I assume this is pictures with source sets?) and object-fit for background images?
Is there a standard/accepted way to replace/replicate the old retina background approach?
This blog post indicates that we should use position:absolute; images with source sets?
https://jasonyingling.me/better-performing-background-images-with-object-fit/
However I'm not sure this is suited for a tiled/repeating background image?
