1 files changed, 45 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/mochitest/helper_zoom_with_dynamic_toolbar.html b/gfx/layers/apz/test/mochitest/helper_zoom_with_dynamic_toolbar.html
new file mode 100644
index 0000000000..261bca1377
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+++ b/gfx/layers/apz/test/mochitest/helper_zoom_with_dynamic_toolbar.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <title>Zooming out to the initial scale with the dynamic toolbar</title>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+
+  <style>
+    html,body {
+      height: 100%;
+      margin: 0;
+      padding: 0;
+    }
+  </style>
+
+  <script type="application/javascript">
+
+async function test() {
+  ok(window.visualViewport.scale > 1.0,
+     "The scale value should be greater than 1.0");
+
+  // Do a pinch-zoom out to restore the initial scale.
+  await pinchZoomOutWithTouchAtCenter();
+  await promiseApzFlushedRepaints();
+
+  is(visualViewport.scale, 1.0,
+     "The initial scale value should be restored to 1.0");
+}
+
+SpecialPowers.getDOMWindowUtils(window).setDynamicToolbarMaxHeight(100);
+SpecialPowers.getDOMWindowUtils(window).setResolutionAndScaleTo(1.1)
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+  </script>
+</head>
+<body>
+</body>
+</html>