Zoom In Window and Download

Support
#1

Hey

I want to zoom in my window to 25% and then download this screen as PDF using a button click.

I know the code for downloading screen is :
JavaScript js = Page.getCurrent().getJavaScript();
js.execute(“window.print();”);

But I want to know how I can zoom in my screen to 25% before downloading it.

Please suggest how this can be done programmatically?