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diff --git a/layout/base/tests/chrome/printpreview_pps6_ref.html b/layout/base/tests/chrome/printpreview_pps6_ref.html
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+++ b/layout/base/tests/chrome/printpreview_pps6_ref.html
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+<!DOCTYPE html>
+<!-- This is a reference case for a "6-pages-per-sheet" scenario. This file is
+     a mockup of a sheet with 6 pages, followed by a sheet with another 6 pages,
+     with the pages all having a 0.4x scale factor applied. -->
+<style>
+html { height: 100%; }
+body {
+  height: 100%;
+  margin: 0;
+  box-sizing: border-box;
+}
+
+.sheet {
+  height: 100%;
+
+  /* We lay out the body as a column-oriented flex container (whose children,
+     in turn, are rows). */
+  display: flex;
+  flex-direction: column;
+}
+
+.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;
+
+  /* This represents the 120px border in the testcase, scaled down 0.4x: */
+  border: 48px 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;
+
+  /* The testcase (rendered at 6-pages-per-sheet) will have 0.2in of extra
+     space in the horizontal axis, which will be distributed equally with
+     0.05in to the left and right of each page in the grid. We mock that up as
+     margin here: */
+  margin: 0 0.05in;
+}
+
+.sheet:nth-child(1) > .row:nth-child(1) > .swatch:nth-child(1) { border-color: cyan; }
+.sheet:nth-child(1) > .row:nth-child(1) > .swatch:nth-child(2) { border-color: yellow; }
+.sheet:nth-child(1) > .row:nth-child(2) > .swatch:nth-child(1) { border-color: pink; }
+.sheet:nth-child(1) > .row:nth-child(2) > .swatch:nth-child(2) { border-color: orange; }
+.sheet:nth-child(1) > .row:nth-child(3) > .swatch:nth-child(1) { border-color: purple; }
+.sheet:nth-child(1) > .row:nth-child(3) > .swatch:nth-child(2) { border-color: olive; }
+
+.sheet:nth-child(2) { break-before: always; }
+.sheet:nth-child(2) > .row:nth-child(1) > .swatch:nth-child(1) { border-color: blue; }
+.sheet:nth-child(2) > .row:nth-child(1) > .swatch:nth-child(2) { border-color: tan; }
+.sheet:nth-child(2) > .row:nth-child(2) > .swatch:nth-child(1) { border-color: fuchsia; }
+.sheet:nth-child(2) > .row:nth-child(2) > .swatch:nth-child(2) { border-color: salmon; }
+.sheet:nth-child(2) > .row:nth-child(3) > .swatch:nth-child(1) { border-color: lightgreen; }
+.sheet:nth-child(2) > .row:nth-child(3) > .swatch:nth-child(2) { border-color: navy; }
+</style>
+<div class="sheet">
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+</div>
+<div class="sheet">
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+<div class="row">
+  <div class="swatch"></div>
+  <div class="swatch"></div>
+</div>
+</div>