Colored texts in HTML are printed black in QPrintPreviewDialog

QPrintPreviewDialog show colored texts as black.

Please, see the attached application.

Steps to reproduce:
1. Launch the application
2. Press "preview" button

Actual result:
Text is shown as black and header text is not centered.

Expected results:
Text must be shown as defined in HTML.

Maybe this is more like a QWebFrame problem so move it under right component if this is a wrong place.
webView->page()>mainFrame()>print(printer);

The problem is not reproducible when using Qt 4.8.