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diff --git a/gfx/layers/apz/test/mochitest/helper_basic_zoom.html b/gfx/layers/apz/test/mochitest/helper_basic_zoom.html
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+++ b/gfx/layers/apz/test/mochitest/helper_basic_zoom.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <title>Sanity check for zooming</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>
+  <script type="application/javascript">
+
+async function test() {
+  let visResEvt = new EventCounter(window.visualViewport, "resize");
+  let visScrEvt = new EventCounter(window.visualViewport, "scroll");
+  // Our internal visual viewport events aren't restricted to the visual view-
+  // port itself, so we can listen on the window itself, however the event
+  // listener needs to be in the system group.
+  let visResEvtInternal = new EventCounter(window, "mozvisualresize",
+                                           { mozSystemGroup: true });
+  let visScrEvtInternal = new EventCounter(window, "mozvisualscroll",
+                                           { mozSystemGroup: true });
+  let visResEvtContent = new EventCounter(window, "mozvisualresize");
+  let visScrEvtContent = new EventCounter(window, "mozvisualscroll");
+
+  var initial_resolution = await getResolution();
+  ok(initial_resolution > 0,
+      "The initial_resolution is " + initial_resolution + ", which is some sane value");
+
+  await pinchZoomInWithTouch(150, 300);
+
+  // Flush state and get the resolution we're at now
+  await promiseApzFlushedRepaints();
+  let final_resolution = await getResolution();
+  ok(final_resolution > initial_resolution, "The final resolution (" + final_resolution + ") is greater after zooming in");
+
+  // Check we've got the expected events.
+  // Pinch-zooming the page should fire visual viewport resize events:
+  visResEvt.unregister();
+  ok(visResEvt.count > 0, "Got some visual viewport resize events");
+  visResEvtInternal.unregister();
+  ok(visResEvtInternal.count > 0, "Got some mozvisualresize events");
+
+  // We're pinch-zooming somewhere in the middle of the page, so the visual
+  // viewport's coordinates change, too.
+  // This is true both relative to the page (mozvisualscroll), as well as
+  // relative to the layout viewport (visual viewport "scroll" event).
+  visScrEvt.unregister();
+  ok(visScrEvt.count > 0, "Got some visual viewport scroll events");
+  visScrEvtInternal.unregister();
+  ok(visScrEvtInternal.count > 0, "Got some mozvisualscroll events");
+
+  // Our internal events shouldn't leak to normal content.
+  visResEvtContent.unregister();
+  is(visResEvtContent.count, 0, "Got no mozvisualresize events in content");
+  visScrEvtContent.unregister();
+  is(visScrEvtContent.count, 0, "Got no mozvisualscroll events in content");
+}
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+  </script>
+</head>
+<body>
+  Here is some text to stare at as the test runs. It serves no functional
+  purpose, but gives you an idea of the zoom level. It's harder to tell what
+  the zoom level is when the page is just solid white.
+</body>
+</html>