How it works
When your users load a page, retina checks each image on the page to see if there is a high-resolution version of that image on your server. If a high-resolution variant exists, the script will swap in that image in-place.
The script assumes you use Apple's prescribed high-resolution modifier (@2x) to denote high-resolution image variants on your server.
Solves rare issues where the battery unexpectedly stops functioning.
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