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I have started to load a few key resources and pages using the prefetch/prerender system.

Is there a way to ensure that the resources in question are actually being preloaded?

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You can also use prerender-test.appspot.com to test that your site works correctly under prerendering. Further, from within Chrome, you can go to chrome://net-internals#prerender to see a list of attempted prerenders and whether they were used, and if they were not used, why they were canceled.

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This seems like it should be the accepted answer. chrome://net-internals#prerender is definitely the best way to test this.
@pseudosavant If it says Prerender Enabled: false go to Settings->advanced-> Privacy/check the prerender box
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Google recommends using the Page Visibility API to test if a page is being prerendered. I'm not sure how well it works cross-browser (but what does in HTML5).

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