Lofesa commented on issue #2051:
URL:
https://github.com/apache/incubator-pagespeed-mod/issues/2051#issuecomment-730305185
As far as I know, mod_pagespeed can´t set any attribute. If you set it must
be by other way rather than pagespeed.
I can´t have tested it, but maybe it malfuntioning. Why? in the attibute is
in place, brownser load the image viewport + arbitrary size. This arbitrary
size is harcoded in the browser and, allmost in chrome, the size varies with
network speed (less speed, more size, because load images need more time).
In other way, pagespeed do their calculation on how and when a image must be
downloaded and maybe these 2 things don´t work well toguether.
I think pagespeed module need to add some way to detect native lazyload
capabilities in the browser and then do nothing when these cap´s are in place
or maybe do nothing if the attribute `loading` is in place, but this last
option is not a good idea with olders brownser. And maybe need to change
data-pagespeed-lazy-src with data-src and data-srcset, because even if are not
a standard, "de facto" it is.
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