Do you know that every website or web application comprises different web pages containing different web elements like buttons, text boxes, progress bars, etc.? However, the web is asynchronous in nature. Hence, all the web elements may not be loaded simultaneously, i.e., the web elements might be loaded dynamically using AJAX (Asynchronous JavaScript And XML).
While performing automation testing in Selenium, your test code or test script could result in erroneous results if it is interacting with a web element that is not yet loaded in the Document Object Model (DOM). Or if it is on another iFrame, tab, or window which is not in focus, or any such scenarios. These types of unexpected erroneous outcomes are known as Selenium focus issues.
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