Re: [w3ctag/design-reviews] TAG Review Request: Form Participation API (#305)

Thank you for the comment.

> Q: formdata event is fired last in sequence. ...

I assume developers rarely want to validate data for ```formdata``` event because the data is not user-editable.  The situation is same as ```<input type=hidden>```, which is not capable for validation.

Adding ```formData``` IDL attribute to ```submit``` event, instead of adding new ```formdata``` event, would make it possible to cancel form submission by validating such data and ```preventDefault()```.  However it isn't an option because ```new FormData(form)``` should collect data and it doesn't submit ```submit``` event.

I'd like to start with the current design.  If many developers want to cancel form submission in ```formdata``` event handlers, we can make the event cancelable later.

> Q: 'formdata' is synchronous ...

Yeah, form submission in ```formdata``` event handlers would make infinite loop.  I'll add a flag to avoid re-entrancy.


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