This page is a demo of the prefetch feature that shipped in Chrome DevTools in Chrome 77.
chrome://versionand make sure that you're on Chrome 77 or later. This feature doesn't exist on earlier versions of Chrome.
prefetch2.csswere requested even though they're not used on this page. This happened because of the
<link rel="prefetch" href="/wndt77/prefetch2.html"/>and
<link rel="prefetch" href="/wndt77/prefetch2.css"/>directives in the
<head>of this page.