Re: [w3c/webcomponents] Need callback for form submit data (#187)

> Isn't it more useful at the end, so you can manipulate or add to data already collected?

I also think it's useful. However the current HTML specification doesn't use ```FormData``` to collect entries of built-in controls.  If it's dispatched at the end, UA needs to convert _form data set_ to ```FormData```, dispatch the event, then convert back the ```FormData``` to _form data set_.  It's complicated, and 'type' information is dropped.



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