HTML5 - How to set setCustomValidity? [duplicate]

Question

How can I address the input field to set the setCustomValidity? It does not work:

js fiddle

$('#numberinput').val("").setCustomValidity('The two email addresses must match.');

Answer 1

Using jQuery you could do the following:

$('#numberinput').get(0).setCustomValidity('The two email addresses must match.');

And not:

$('#numberinput').val("").setCustomValidity('The two email addresses must match.');