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<!DOCTYPE html>
<meta charset="utf-8">
<title>At-Page Size</title>
body {
margin: 0;
.rect {
/* An outlined rect that is 1inch smaller in each dimension,
to help visualize if the output page is the right size or not: */
width: calc(4in - 1in - 4px);
height: calc(12in - 1in - 4px);
border: 2px solid black;
@page {
size: 4in 12in;
margin: 0.5in;
<div class="rect">
If you print-preview using the "Save to PDF" page target, you should see an
4in-by-12in-size sheet of paper by default, just 1 inch wider (0.5in margins) than the
black-outlined box.