Add retina "2x" in attribute "srcset"
I need to add the "2x" to the url attribute srcset in wordpress 4.4.2.
Maybe you can do so using a function in the functions.php file?
WordPress puts all resized versions of an image with the same aspect ratio into the srcset property. So if you need a "2x" image and one is not being generated already you could add an image size via add_image_size().
For the 2x image to be inserted in the correct circumstances you might need to tweak the sizes property via the wp_calculate_image_sizes filter.
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