More specifically, there are two possible value formats that will pass validation: An empty string("") indicating that the user did not enter a value or that the value was removed.
It must be unique among the forms in a document and not just an empty string in HTML 5. novalidate HTML5 This Boolean attribute indicates that the form is not to be validated when submitted.
If both the user name and password have not been set, or if a blank character string/null is set, the user will be connected without using the user name and password.
The DOM specification says that the correct return value in this case is actually the empty string, and some DOM implementations implement this behavior.
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