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I just added a context menu option to DOMVisitor to set the value of an INPUT element using the DevTools methods. It updates the "search" box in this forum with the "querty" value.
Read the code comments in that demo for more information about the methods used and the steps required to update the "value" attribute in the INPUT element.
The DevTools use JSON to send information so I also added a new TCEFJson class to make it easier to read those values.