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"... Some of the reasons prerendering might not happen: ... * Chrome encountered another prerender directive within the last 500 ms." [1]

List Https as reason to not prerender. There goes the idea of using it for a sales funnel.

I bet Chrome's implementation of this is super-careful about avoiding loops or going deeper than one level.

I would imagine that it doesn't prerender the next page until the first is actually displayed.

Yep, that's how it's implemented.

your nick doesn't do you justice.

It wasn't meant as an insult - honestly!