Run/stop button labels kept up-to-date

Regardless of whether run from container or run/stop button.
Datatransfer uses text/html

Unless it triggers an exception (as it does in IE9).
Added element widgets

Backside not developed or tested yet.
Also resize seems not to work (at least for 'img' elements).
Can be created by drag and drop of HTML elements.
Accepts plain text drops now
Element HTML can be edited

And the appearance updates.
Robots can be trained to edit element HTML
Dropped plain text is treated as a PRE element