chromium/chrome/test/data/predictor/dns_prefetch.html

<link rel="dns-prefetch" href="http://illegally-long-hostname-over-255-characters-should-not-send-an-ipc-message-to-the-browser-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.org/">
<link rel="dns-prefetch" href="http://chromium.org/">