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diff --git a/layout/base/tests/chrome/printpreview_pps_uw9_ref.html b/layout/base/tests/chrome/printpreview_pps_uw9_ref.html
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+<!DOCTYPE html>
+<!-- This is a reference case for a "9-pages-per-sheet" scenario. This file is
+     a mockup of a sheet with 9 pages, with the pages all having a 0.2x scale
+     scale factor applied. (We end up with that scale factor by subtracting the
+     requested unwriteable margins from the sheet, and dividing up the
+     remaining space equally among the "virtual pages".)  -->
+<style>
+html {
+  display: flex;
+  height: 100%;
+  margin: 0;
+}
+body {
+  /* As a flex item (a child of the html element), fill the available area. */
+  flex: 1;
+
+  /* We lay out the body as a column-oriented flex container (whose children,
+     in turn, are rows). */
+  display: flex;
+  flex-direction: column;
+
+  /* These margins represent the margins around the pages-per-sheet "page grid"
+     in the testcase.  They represent the unwriteable area, as well as the
+     "centering" area in the axis that has extra space, which in this case is
+     the vertical axis. These values come directly from the
+     unwriteableMargin{Top,Right,Bottom,Left} values in this testcase's setup
+     code in printpreview_helper.xhtml, with 1.7in added to margin-top and to
+     margin-bottom, to vertically center the page-grid within the sheet's
+     writeable area. */
+  margin-top: 1.9in;    /* 0.2in + 1.7in for centering */
+  margin-right: 0.8in;
+  margin-bottom: 2.1in; /* 0.4in + 1.7in for centering */
+  margin-left: 1.2in;
+}
+
+.row {
+  /* Give each row an equal share of the available height: */
+  flex: 1;
+
+  /* ...and render them as row-oriented (by default) flex containers: */
+  display: flex;
+}
+
+.swatch {
+  box-sizing: border-box;
+
+  /* These represent the 120px borders in the testcase, scaled down 0.2x: */
+  border: 24px solid;
+
+  /* Share the width equally among the swatches. (The height will be
+     automatically set to the flex container's row height, via default
+     'align-self' behavior.) */
+  flex: 1;
+
+  /* These values come directly from the unwriteableMargin values in the
+     testcase's configuration code in printpreview_helper.xhtml, with
+     each measurement scaled down by exactly 0.2x. */
+  margin-top: 0.04in;
+  margin-right: 0.16in;
+  margin-bottom: 0.08in;
+  margin-left: 0.24in;
+}
+.row:nth-child(1) > .swatch:nth-child(1) { border-color: cyan; }
+.row:nth-child(1) > .swatch:nth-child(2) { border-color: yellow; }
+.row:nth-child(1) > .swatch:nth-child(3) { border-color: pink; }
+.row:nth-child(2) > .swatch:nth-child(1) { border-color: orange; }
+.row:nth-child(2) > .swatch:nth-child(2) { border-color: purple; }
+.row:nth-child(2) > .swatch:nth-child(3) { border-color: olive; }
+.row:nth-child(3) > .swatch:nth-child(1) { border-color: blue; }
+.row:nth-child(3) > .swatch:nth-child(2) { border-color: tan; }
+.row:nth-child(3) > .swatch:nth-child(3) { border-color: fuchsia; }
+</style>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>