https://walkersands-dot-yamm-track.appspot.com/Redirect?ukey=1c0lDrpp3tzR-ZGgx0ACOpC1_eYEevgyIxn6SzFv44WM-0

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: