* How it started
During the implementation of  [incr Tcl in Javascript] there did raise the question, how to get easy and efficient access to the [DOM] information. First idea was to give a user direct access to javascript [DOM] commands using a Tcl wrapper, but that would force the user to learn a lot of javascript and its model for widgets and events. So after some thoughts in that direction it seemed better to try to map [Tk] functionality to javascript [DOM] and event model. There followed the decision on directly using [DOM] for the implementation without first using [HTML] code and let the browser convert that to the [DOM] info. 
Next there was the need to find out how to map basic Tk widgets to the DOM model like:
button
entry
frame
label
toplevel

As I had in mind to use that as a client/frontend for [Reporting Tools with Tcl], these were the base widgets for starting. 
After some experiments I decided to use 
 <div>
for a label widget,
 <button>
for a button widget,
 <input>
for an entry widget and again
 <div>
for a frame widget and a toplevel widget.

(Part of [Tk Widgets in Javascript Paper])

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