Submitting a form should fire click on first submit button

Also, elements default to type "submit" if unspecified.

Illustrated in this jsfiddle: http://jsfiddle.net/dkordik/y25r4qnp/

I have a pull request to fix this incoming

Start with the issue description and reproduce the behavior in the linked JSFiddle. Verify form submission with an unspecified button type and confirm that the first submit button receives a click event, including when the button is a element without an explicit type.

Written by the indexing model from the issue text.