I'm unsure of whether I need to use both no-webp and no-jpeg2000, like this:
.no-webp .no-jpeg2000 .coverart.pli { background-image: url('../img/coupe.jpg'); }
or if it is sufficient to only use one as a fallback, i.e.:
.no-webp .coverart.pli { background-image: url('../img/coupe.jpg'); }
Thanks in advance!
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