Lofesa edited a comment on issue #1849: Add srcset as a possible category for UrlValuedAttribute URL: https://github.com/apache/incubator-pagespeed-mod/issues/1849#issuecomment-453491944 Hi @oschaaf Yes, is a improvement, like data-src work as img category. As you know, I´m not a developer but I think most of the work is done as is the same issue as srcset label. Perhaps an other issue/improvement with the lazyload_images filter because it load images in onload event, no matter if LazyloadImagesAfterOnload is set to on or off and Pagespeed Insigths don´t recognize that images are lazyloaded. Because of that I´m using a wordpress plugin based on [lazysizes ](https://github.com/aFarkas/lazysizes) that need data-src and data-srcset
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