[erroneousfunk]

Also see [e-mail]: http://asdf.com/asdfemail.html I've gone to asdf.com for about 15 years now, and it hasn't changed it all. It's also always up, so it's handy to go to to test and see if I have Internet. I love that site.

[SerpentJoe]

It also loads quickly and runs almost no Javascript, making it great for anything you want to test in the dev console.

[howsiwei]

I use http://to/ for testing purposes. It has the shortest url and the the webpage consists of only 4 short lines of html.