tracking of the form fields - bounce rates

[grain209]

I want to be able to use keen-tracking to detect weak points of my html forms.
Bad design of the form will impact conversion rates and overall happiness of potential customers.

For example
https://jsfiddle.net/ywain/dheyftzp/

Let's track the focus of each field - this way we'll be able to create a funnel to see which fields are so hard to complete that it forces our users to leave.

Some additional informations would be great, eg:
time spent completing this field,
maybe - the most popular values for this field? track value, then use .query group_by value
-- snippet how to implement:
number of errors during validation,
most popular errors,

Let's start with tracker for a static html form. We'll create a react component/hoc later on.