http://us.checkpointsystems.com/wp-content/themes/custom-theme/core/js/picturefill.min.js?ver=4.6.1
http://www.rh-solutions.com/bundles/front/js/picturefill.min.js
http://us.checkpointsystems.com/wp-content/themes/custom-theme/core/js/picturefill.min.js?ver=4.5.3
https://www.maf-uk.org/sites/all/themes/maf/assets/js/picturefill.2.1.0.min.js