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The DOM & URL are the safest places to store client-side state. This doesn't cover all use cases, but it does cover the space of clicking pre-authorized links in emails, etc.

I spend a solid month chasing ghosts around iOS Safari arbitrarily eating cookies from domains controlled by our customers. I've never seen Google/Twitter/Facebook/etc domains lose session state like this.

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Safari is a lot more strict about cookies than Chromium or Firefox, it will straight up drop or ignore (or, occasionally, truncate) cookies that the other two will happily accept.

I had hoped when writing this article that Google would look at Safari and see that it was always strict about feel comfortable about changing to be the same. But doing so now would unfortunately break too many things for too many users.

If I open a second window or tab I expect when I go to 'myemail.com' that it knows who I am and shows me my account even though the url in the 2nd tab doesn't have any extra info in the URL

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