Immediately after switching the page, it will work with CSR.
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"The idea of notification tags is that more than one notification can share the same tag, linking them together. One notification can then be programmatically replaced with another to avoid the users' screen being filled up with a huge number of similar notifications."
Apple are the only ones not supporting this, and much of the time with web stuff they have a point, but this one just seems obtuse.
Secondly, unfortunately the problem with iOS Safari notifications is once you get them working they cannot do things like group properly or replace each other. It just becomes a horrifying flood until you clear them all. If they have made iOS respect the tag and action fields, which are conspicuous by absence from their examples, then it will be game on.
I hope this is a sign that this is finally going to be working one day.
The impressive part here isn't so much the emulator, but all the rest. A pascal compiler for the Transputer as a teenager in early 90s Mexico? That's brilliantly unlikely.