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Link prefetching
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<p>Link prefetching allows web browsers to pre-load resources. This speeds up both the loading and rendering of web pages. Prefetching was first introduced in <a href="/facts/HTML5/HBAxEAr6">HTML5</a>. </p><p>Prefetching is accomplished through hints in web pages. These hints are used by the browser to prefetch links. Resources which can be prefetched include: <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a>, <a href="/facts/Cascading_Style_Sheets/tA90XBQo">CSS</a>, image, audio, video, and <a href="/facts/Web_typography/vc2cQf6o">web fonts</a>. <a href="/facts/Domain_Name_System/rfxdWFsj">DNS</a> names and <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">TCP</a> connections can also be hinted for prefetching. </p>