page/page.go
func (p PrintToPDFParams) WithPrintBackground(printBackground bool) *PrintToPDFParams {
	p.PrintBackground = printBackground
	return &p
}
func (p PrintToPDFParams) WithPrintBackground(printBackground bool) *PrintToPDFParams {
	p.PrintBackground = printBackground
	return &p
}
// WithPrintBackground print background graphics. Defaults to false.