Note from 3 July 2020
TIL: if you cache images with a Service Worker, and you have a Content Security Policy, the image's origin should be in both the img-src and connect-src directives.
Details from @qubyte: https://qubyte.codes/blog/content-security-policy-and-service-workers
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older note:
Note from 3 July 2020 -
newer note:
Note from 18 July 2020