After the link to Aral's post yesterday, some details in this post from Jeremy Keith.

This is not a minor change. This is a crippling attack on service workers, a technology specifically designed to improve the user experience for return visits, whether it’s through improved performance or offline access.

I love PWAs, I teach how to build them, I help companies decide if that's the good option for their use cases, and I always struggle explaining how/why Apple is slow in adopting these technologies and user experiences. This won't help.

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