Take a screenshot of the currently loaded page in the selected WebDriver, or a specified WebElement. The WebDriver respective WebElement must support taking screenshots, else an error is triggered (e.g. the HtmlUnitDriver does not allow to take screenshot, as it is not running within a GUI). The extent of the resulting screenshot depends on the actual WebDriver (some WebDrivers capture the entire page, or the current window, or the visible frame, or the entire screen).
Quoting from the Selenium API documentation:
For WebDriver […], this makes a best effort depending on the browser to return the following in order of preference:
For WebElement […], this makes a best effort depending on the browser to return the following in order of preference:
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