If you want to see context aware pre-fetching done right go to mcmaster.com ...
There are good reasons to have a small cheap development staging server, as the rate-limited connection implicitly trains people what not to include. =3
And this! https://www.mcmaster.com/help/api/ Linked from the footer of every page!
I'm so happy to have seen their web site that I want to do business with them, even though I have no business to be done.
Making it easy to buy stuff from them definitely helps their bottom line. Unfortunately the few companies I've wanted to buy from but their website was horrible and made me go elsewhere, either completely ignored or dismissed my complaints about having just lost a customer.
Some CAD/CAM applications directly integrate a component toolbox. =3
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