link rel="prefetch" Element
Prefetch Your Content for a Primed Cache Experience
By Anticipated Preloading and explicitly pre-loading files, docs, resources that are not immediately in use, you give users a primed cache experience.
<link rel="prefetch" href="http://domain.com/pix/of-your-moms/at-my-house.png" />
link rel="prefetch" directs the browser to begin loading the image specified by href="" once the current document has completely loaded. When the user directs to the page (hopefully it’s next, but not necessarily) that has prefetched images, you have one less request necessary to make that page load.