https://www.aluminco.com/umbraco/newsletterstudio/tracking/trackclick.aspx?nid=185042255248005212099220144014155161254154037038

This is display.cgi (source). It takes some text you enter into a form, and displays it for you as HTML. This is a great way to see how some HTML code looks in your (or someone else's) browser. So paste 'n go: