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diff --git a/layout/style/test/test_moz_device_pixel_ratio.html b/layout/style/test/test_moz_device_pixel_ratio.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=474356
+-->
+<head>
+ <title>Test for Bug 474356</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+ <style>.zoom-test { visibility: hidden; }</style>
+ <style><!-- placeholder for dynamic additions --></style>
+</head>
+<body onload="run()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=474356">Mozilla Bug 474356</a>
+<div id="content" style="display: none">
+
+</div>
+<script type="text/javascript">
+</script>
+<pre id="test">
+<div id="zoom1" class="zoom-test"></div>
+<div id="zoom2" class="zoom-test"></div>
+<div id="zoom3" class="zoom-test"></div>
+<script class="testbody" type="application/javascript">
+
+/** Test for Bug 474356 **/
+
+SimpleTest.waitForExplicitFinish();
+
+function run() {
+ function zoom(factor) {
+ var previous = SpecialPowers.getFullZoom(window);
+ SpecialPowers.setFullZoom(window, factor);
+ return previous;
+ }
+
+ function isVisible(divName) {
+ return window.getComputedStyle(document.getElementById(divName), null).visibility == "visible";
+ }
+
+ function getScreenPixelsPerCSSPixel() {
+ return SpecialPowers.DOMWindowUtils.screenPixelsPerCSSPixel;
+ }
+
+ var screenPixelsPerCSSPixel = getScreenPixelsPerCSSPixel();
+ var baseRatio = 1.0 * screenPixelsPerCSSPixel;
+ var doubleRatio = 2.0 * screenPixelsPerCSSPixel;
+ var halfRatio = 0.5 * screenPixelsPerCSSPixel;
+ var styleElem = document.getElementsByTagName("style")[1];
+ styleElem.textContent =
+ ["@media all and (-moz-device-pixel-ratio: " + baseRatio + ") {",
+ "#zoom1 { visibility: visible; }",
+ "}",
+ "@media all and (-moz-device-pixel-ratio: " + doubleRatio + ") {",
+ "#zoom2 { visibility: visible; }",
+ "}",
+ "@media all and (-moz-device-pixel-ratio: " + halfRatio + ") {",
+ "#zoom3 { visibility: visible; }",
+ "}"
+ ].join("\n");
+
+ ok(isVisible("zoom1"), "Base ratio rule should apply at base zoom level");
+ ok(!isVisible("zoom2") && !isVisible("zoom3"), "no other rules should apply");
+ var origZoom = zoom(2);
+ ok(isVisible("zoom2"), "Double ratio rule should apply at double zoom level");
+ ok(!isVisible("zoom1") && !isVisible("zoom3"), "no other rules should apply");
+ zoom(0.5);
+ ok(isVisible("zoom3"), "Half ratio rule should apply at half zoom level");
+ ok(!isVisible("zoom1") && !isVisible("zoom2"), "no other rules should apply");
+ zoom(origZoom);
+
+ SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>