Value piping
Map values across tags using the id attribute.
<form id="form">
<input type="text" id="firstname" cf-questions="Please write your firstname" />
<input type="text" id="lastname" cf-questions="Hi {firstname}, what is your last name?" />
<input type="text" cf-questions="{firstname} {lastname}, what a solid name!" />
</form>
Example
See the Pen Conversational Forms - Value piping by SPACE10 (@space10) on CodePen.