https://www.groupon.com/ General Retail 1-Page 115 seconds
Groupon has implemented one of our favorite checkouts. It is a true one-page checkout, with two sections on the page for billing and shipping, respectively. Progress is clear by virtue of everything being on the same page, and there are no distractions in the header or unnecessary fields. The design is clean and forms are robustly designed - errors are highlighted immediately, as are valid inputs.
Groupon is an excellent show of how a checkout can be condensed to a single page and made to feel fast and frictionless.
The Groupon Desktop Checkout complies with 76% of our recommended best practices.