The element is visible on the screen, yet Selenium is unable to locate it, why?

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There can be several reasons why this could happen:

1. Element is present inside an iFrame: If the element is inside an iFrame, Selenium needs to first switch to the iFrame before attempting to locate the element.

2. Element is loaded dynamically: If the element is loaded dynamically after the page is loaded, there may be a delay between when the page is loaded and when the element is available for Selenium to locate. In this case, we may need to wait for the element to become visible using explicit waits.

3. Element is hidden or not visible: Sometimes, elements may be hidden or not visible due to CSS or JavaScript. In this case, we may need to find a way to make the element visible using JavaScript or by scrolling to the element.

4. Incorrect locator strategy: If the locator strategy used to locate the element is incorrect, Selenium will not be able to find the element. In this case, we may need to use a different locator strategy such as CSS selector, XPath or class name.