As a genre, fantasy is often looked down upon by fans and writers of science fiction. There are some who argue that the worlds created by JRR Tolkien were influenced by the events of the early twentieth century. No matter how you interpret his works, one of the central themes of The Hobbit and The Lord of the Rings that remains timeless is that if you come into possession of and use something powerful, like an all-powerful magic ring, you should be prepared for the harm it can cause.
Before we get too carried away with Tolkien references, this post is about visual UI testing, not hobbits. Similar to Tolkien’s central theme, the goal of this post is to inform you that any time you use visual UI testing, you should consider the broader issues it involves. Specifically, this post explores the reasons why developers who use visual testing need to think about more than simply testing the parts of a web app that they can see. It’s the things you cannot see that will trip you up, not the things you can see. Many of these unseen page elements have very little to do with the application itself or its underlying code but are caused by the display technologies that are used to present the application to users.
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