[1] CSS Print Profile ( ( 版)) <http://www.w3.org/TR/2013/NOTE-css-print-20130314/#section-properties>
[2] CSS Print Profile ( ( 版)) <http://www.w3.org/TR/2013/NOTE-css-print-20130314/#section-images>
[3] CSS Print Profile ( ( 版)) <http://www.w3.org/TR/2006/WD-css-print-20061013/#section-properties>