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Prerender on hover?

InstantClick is a pretty popular JavaScript library (4,344 stars, as I type). This is the gist:

Before visitors click on a link, they hover over that link. Between these two events, 200 ms to 300 ms usually pass by (test yourself here). InstantClick makes use of that time to preload the page, so that the page is already there when you click.

You hover a link, it Ajaxs for that page and prerenders it. On click, it replaces the <body></body>Read article “Prerender on hover?”