I am sure that it is not yet implemented. For him, there is a problem with github, and it seemed to be a very popular feature request.
https://github.com/rogerwang/node-webkit/issues/56
printing support was added in April. This was in the release notes for 0.50.
- Printer Support (# 56): Now works window.print (). print preview feature is not yet enabled. We plan to add it to the release of version 0.5.2.
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