- The sole purpose of putting a Web beacon in a page is to cause a secondary transaction in order to set third-party cookies.2005, Craig D. Knuckles, David S. Yuen, Web Applications: Concepts & Real World Design, John Wiley & Sons, →ISBN, page 363:
- A web beacon is a small graphic image that is usually transparent (and therefore invisible to the user) and no larger than one pixel by one pixel that is placed on a website or in an email.2012, Lori Andrews, I Know Who You Are and I Saw What You Did, Simon and Schuster, →ISBN, page 23: