Selenium WebDriver get text from CSS property “content” on a ::before pseudo element

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I am not 100% sure if WebDriver can retrieve pseudo element content for you. I think you would need to use Javascript. Below works, I tested.

String script = "return window.getComputedStyle(document.querySelector('#validationError'),':before').getPropertyValue('content')";
JavascriptExecutor js = (JavascriptExecutor)driver;
String content = (String) js.executeScript(script);
System.out.println(content);

This should print

The information provided is either invalid or incomplete.

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