Lofesa commented on issue #1876: Image Optimization: Does MPS optimize <source> images? URL: https://github.com/apache/incubator-pagespeed-mod/issues/1876#issuecomment-576228027 Hi @FalkoHilbert @bastianschwarz @hit1205 I have taken a look in to the picture spec and have some questions about the use cases. I´m not sure pagespeed need to optimize the picture element, or all most not in all the cases. I took a look at this [doc](https://dev.opera.com/articles/responsive-images/). If picture element is used to ofert to the browser choose whetbeen webp or jpg format, whats is supposed that pagespeed can do? If transforming all images to webp, the picture element is useless. If only used for ofert different sizes in different viewports, why don´t use img srcset? Maybe the only use case that pagespeed can optimize is when different images are served for diferent sizes. I think is not easy to determine when pagespeed need to only resize images, or resize and convert to webp.... I´m not a developer and don´t know how hard to do this can become.
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