a. While inspecting with Firebug it is getting disappeared.
b. Right click on top of the error message doesn't work to inspect the element in DOM structure.
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");
In Python:
self.browser.get(self.live_server_url + registration_path)
email_input = self.browser.find_element_by_id('id_email_input')
validation_message = email_input.get_attribute("validationMessage");
http://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.remote.webelement
You get all html5 required field validation in this way.
String errorMessage = driver.findElement(By.id("email")).getAttribute("validationMessage");
The HTML5 input field error message is actually the HTML5 Constraint validation message which is the outcome of Constraint API's element.setCustomValidity() method.
To retrieve the text Please enter an email address. you can use either of the locator strategies:
Using Java and cssSelector:
WebElement emailField = driver.findElement(By.name("email"));
System.out.println(emailField.getAttribute("validationMessage"));
Using Python and xpath:
emailField = driver.find_element(By.NAME, "email")
print(emailField.get_attribute("validationMessage"))
You can find a couple of relevant detailed discussion in:
