So I test form valid with selenium and found out a something confusing.

If I set input field mandatory to True, when I useing clear command to clear the input value, even though the valid check returned false, clear() itself didn't work because you can still see the value inside input field. If I add another input using sendkeys() after clear() command, the feed back meessage will return with the result of second input value add up with first input value.

If I set input filed mandatory to False, clear()  still wont work but act differently. First, the value will disapper from input field, and If I access the input value after clear() , the feed back message will still show the value before clear() , but this time the second input after clear()  will result with the feed back message only contain the second input. And this behavior is different from the result when you put mandatory to true.

I'm so confused.