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Agreed. It seems like Google has no desire to implement this however. Presumably because they feel prerendering will give Chrome a significant speed advantage and they don't want site owners to opt out from day one.

Looks like the best you can get is a JS property once the page is loaded. http://code.google.com/chrome/whitepapers/pagevisibility.htm...




it seems like Google has no desire to implement this however

Why do you say that? They seem to send "X-Purpose: instant", at least according to their FAQ[1] and bug reports[2].

[1]: http://www.google.co.uk/chrome/intl/en-GB/webmasters-faq.htm...

[2]: https://code.google.com/p/chromium/issues/detail?id=91735


Cool. I couldn't find any reference to this in the FAQ when I was reading :)




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