The Add to WishList button allows users to add wishes from any website to their wish list at WishList.com. To add a wish, the following information is captured from a webpage when the Add to WishList button is click, and only when the button is clicked:

Product images, product name and description, product prices, and product url.

That information is then edited by users prior to it being saved as a wish in their wish list at WishList.com. That information is used by WishList.com to maintain the user's list of wishes.