"Window shopping" is used for a consumer who has no intent to purchase and I believe the term originated well before shopping became accessible online.
Is there a different term for online-window-shopping.
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Internet browsing - Window Shopping Online (from www.sites.google.com)
Traditional In-Store Browsing vs. Online Browsing
Traditional window shopping or browsing allows the shopper to gather information about products through using their eyes, nose, and fingers. From a merchant’s perspective, window shopping highlights certain products for customers via in store displays and promotions. Browsing is integral to the general shopping experience in a physical store and in an online environment.
Online shopping provides convenient access, a large selection, and available product information. Other advantages to shopping online include speed, lack of sales pressure, and lack of crowds. Many online shoppers feel that they have more freedom and control in the virtual marketplace as opposed to the physical. (Wolfinbarger & Gilly, 2001)