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diff --git a/dom/base/test/file_domwindowutils_dynamic_toolbar.html b/dom/base/test/file_domwindowutils_dynamic_toolbar.html
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+++ b/dom/base/test/file_domwindowutils_dynamic_toolbar.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script>
+ const ok = window.opener.ok;
+
+ SpecialPowers.getDOMWindowUtils(window).setDynamicToolbarMaxHeight(100);
+ ok(window.visualViewport.width > 0,
+ "Setting the dynamic toolbar max height shouldn't clobber the visual " +
+ "viewport size");
+ ok(window.visualViewport.height > 0,
+ "Setting the dynamic toolbar max height shouldn't clobber the visual " +
+ "viewport size");
+
+ window.opener.next();
+ window.close();
+</script>
+</body>
+</html>