WebDriver is a standardized API that allows you to inspect and control a user agent (for example, a browser or mobile application). It was originally conceived in 2006 by Simon Stewart, a Google engineer at the time. It has now been defined by the World Wide Web Consortium (W3C), and its specification can be found at https://www.w3.org/TR/webdriver/. The document is currently in the Candidate Recommendation stage.

Instead of injecting JavaScript scripts into the web page and using them to mimic user interaction, Selenium WebDriver uses the WebDriver API, which most browsers support. However, you may see variation in the level of support, as well as how the standard is implemented, between different browsers.

While the API is platform- and language-neutral, there have been many implementations of it. Specifically, we are going to be using the official JavaScript binding, which is available as the "selenium-webdriver" package on NPM.