window.print() in iframe

When I call window.print() in a iframe, the print out font-size is very small, but if I open the page in a new windows the font-size is regular. Is there any problem that may affect the font size when call windo开发者_Python百科w.print() in a iframe.

I also call window.print() in this way, but it still the same

var obiframe = parent.obnle.window;
obiframe.focus();
obiframe.print();