invalid event is fired when a submittable element has been checked and doesn't satisfy its constraints. The validity of submittable elements is checked before submitting their owner form, or after the
checkValidity() of the element or its owner form is called.
|| ||The event target (the topmost target in the DOM tree).|
|| ||The type of event.|
|| ||Does the event normally bubble?|
|| ||Is it possible to cancel the event?|
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