Does Offline Support work in Safari with r260?

R260 removed the appcachse because "all major browsers now support Service Workers and AppCache is on the deprecation path"

According to MDN, Safari, neither desktop nor mobile, supports service workers.

developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API

I found conflicting information that Safari does support service workers in 11.3 and later.

developer.apple.com/library/archive/releasenotes/General/WhatsNewInSafari/Articles/Safari_11_1.html

But even if that is accurate iPhone 5 and below and iPad gen4 and below are left out. That is about 13% of iOS users.

data.apteligent.com/ios