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"Predictive prefetching makes sure Chrome already has the page data before you finish typing."

As a website owner, I really hate that 'feature', it really screws up the exit rate in my site stats (I don't run ads on my sites.)

You could use the page visibility API to wait until the page is visible before loading the analytics code.

This is only for prerendering. I think joshuahedlund is right about prefetching.

I always assumed prefetching just grabbed html output... does it run javascript too?

Prefetching just grabs HTML.

Chrome also does prerendering in some cases, which runs JS, fetches stylesheets, etc. The user may or may not ever see the result, of course.