Tab key vs Enter key
I have branching logic that is in part based on whether the user has entered anything in a text box. The question is the last one in its group, so the group with the branching logic will only appear if the user presses the Tab key or clicks their mouse somewhere outside of the text box. This is not intuitive, so I currently have a big warning message telling them they must do this in order to activate the remainder of the form. I would like the "Enter" key to work for this purpose - it is more natural when a person reaches the end of a form (or what looks like the end of a form), and they are to provide text, that they will press "Enter", rather than "Tab", since there is nothing visible to "Tab" to.

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