Lofesa commented on issue #1876: Image Optimization: Does MPS optimize <source> images? URL: https://github.com/apache/incubator-pagespeed-mod/issues/1876#issuecomment-575267648 Hi @FalkoHilbert I have no tested it, but theoretically yes. The PR introduces a new category for srcset and data-srcset. The AddUrlValuedAttribute takes a html element (source) with an attribute (src) and treat it as an (image). If you have` <picture> <source src=xxxxx >` you can probe it w/o apply the PR cause src is a category stablished before the PR, only if you have srcset or data-srcset need the PR. I will say, now w/o any change to pagespeed you can try: `pagespeed AddUrlValuedAttribute source src image`. I will try to include the picture element to no need this hack if I have time and make a PR for that. Try this option and come here to comment if it works.
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