View print stylesheets with Chrome DevTools

The CSS styles used in the print mode can be defined using the print media type:
@media print {
  ...
}
However, we can't see these styles under the Styles panel in Chrome DevTools. In order to debug the print styles, we have to force the current page into the print preview mode.
Under the Styles panel, DevTools will show the print styles for the selected element if there are. In the following screenshot, you will see the print styles of .rpv-print-page-thumbnail elements.
Emulate print CSS
Emulate print CSS