I've created an image to print throught web with 2480x3508 of resolution, that corresponds to the A4 standard. So i expect that the image cover the entire A4 paper, while when i go in the print preview and set to "0" all margins, i note some blank part on the left and bottom side of the paper. Why happen this?
This is the page url http://americanhorizon.altervista.org/provastampa.html
and this the result of the print preview

Senza titolo-1.jpg