How to get the text from the HTML5 input field error message in Selenium?

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The Selenium API doesn’t support directly a required field. However, you can easily get the state and the message with a piece of JavaScript (Java):

JavascriptExecutor js = (JavascriptExecutor)driver;

WebElement field = driver.findElement(By.name("email"));
Boolean is_valid = (Boolean)js.executeScript("return arguments[0].checkValidity();", field);
String message = (String)js.executeScript("return arguments[0].validationMessage;", field);

Note that it’s also possible to use getAttribute to get the validationMessage even though it’s a property:

String message = driver.findElement(By.name("email")).getAttribute("validationMessage");

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