Check if “Please enter an email address” message appears

Question

Given a simple page:

  
  click

If I enter anything in

Answer 1

You could try like this

JavascriptExecutor js = (JavascriptExecutor) driver;
driver.findElement(By.cssSelector("input[type='email']")).sendKeys("asd");
Object s=js.executeScript("return document.getElementById(\"a\").validity.valid");
System.out.println(s);
driver.findElement(By.cssSelector("input[type='email']")).sendKeys("asd@gmail.com");
s=js.executeScript("return document.getElementById(\"a\").validity.valid");
System.out.println(s);

Output for above line is

false
true

So based on that you can conclude that whether the given value is valid or not.

Below javascript logic will return true/false based on the validity of the field

document.getElementById(\"a\").validity.valid

P.s : I assume input tag has id "a"