Re: [w3ctag/design-reviews] Portals (#331)

@jeremyroman Unfortunately, I think restricting in a portal and then lifting those restrictions on promotion is not workable. So this would remain a showstopper for Safari (and maybe Firefox too, not sure of their tracking protection details these days).

To expand a bit: we have a way of lifting storage restrictions based on an API call for the site, with user consent (it pops up an alert). It's called Storage Access API. Mozilla also implements this API. Lifting storage restrictions transparently without any interaction by the site would likely not work. Sites would get a mix of data from different storage partitions if they were not prepared for this happening. Or they might see only the stale info. The site has to know to reload the relevant state, which is why we ask embeds to opt into this. Based on this, auto-promoting portals to unrestricted storage when they get promoted to full screen is likely not viable.

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