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diff --git a/gfx/layers/apz/test/mochitest/helper_zoomToFocusedInput_iframe.html b/gfx/layers/apz/test/mochitest/helper_zoomToFocusedInput_iframe.html
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+++ b/gfx/layers/apz/test/mochitest/helper_zoomToFocusedInput_iframe.html
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+<!DOCTYPE>
+<html>
+  <head>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Checking zoomToFocusedInput scrolls that focused element is into iframe</title>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  </head>
+<body>
+<div style="height: 8000px;">ABC</div>
+<iframe style="height: 30em;"></iframe>
+</div>
+<!-- Leave additional room below the element so it can be scrolled to the center -->
+<div style="height: 1000px;">ABC</div>
+<script type="application/javascript">
+async function test() {
+  let isCrossOrigin = (location.search == "?cross-origin");
+  let iframeURL =
+    SimpleTest.getTestFileURL("helper_iframe_textarea.html")
+  if (isCrossOrigin) {
+    iframeURL.replace(window.location.origin, "https://example.com/");
+  }
+
+  let iframe = document.querySelector("iframe");
+  const iframeLoadPromise = promiseOneEvent(iframe, "load", null);
+  iframe.src = iframeURL;
+  await iframeLoadPromise;
+
+  await SpecialPowers.spawn(iframe, [], async () => {
+    await content.wrappedJSObject.waitUntilApzStable();
+  });
+
+  iframe.focus();
+
+  await SpecialPowers.spawn(iframe, [], async () => {
+    let textarea = content.document.querySelector("textarea");
+    for (let i = 0; i < 20; i++) {
+      textarea.value += "foo\n";
+    }
+    textarea.focus();
+  });
+
+  await SpecialPowers.spawn(iframe, [], async () => {
+    await content.wrappedJSObject.waitToClearOutAnyPotentialScrolls(content.window);
+  });
+
+  await SpecialPowers.spawn(iframe, [], async () => {
+    let textarea = content.document.querySelector("textarea");
+    textarea.setSelectionRange(0, 0);
+  });
+
+  window.scrollTo(0, 0);
+  await SpecialPowers.spawn(iframe, [], async () => {
+    await content.wrappedJSObject.waitToClearOutAnyPotentialScrolls(content.window);
+  });
+  is(0, window.scrollY, "scroll position is reset");
+
+  let transformEndPromise = promiseTransformEnd();
+  await SpecialPowers.spawn(iframe, [], async () => {
+    SpecialPowers.DOMWindowUtils.zoomToFocusedInput();
+  });
+  await promiseApzFlushedRepaints();
+
+  ok(window.scrollY > 0, "scroll position isn't top");
+  let iframeWindowScrollY = await SpecialPowers.spawn(iframe, [], () => {
+    return content.window.scrollY;
+  });
+  ok(iframeWindowScrollY > 0, "scroll position into iframe isn't top");
+  let prevPosY = window.scrollY;
+
+  await transformEndPromise;
+  await promiseApzFlushedRepaints();
+
+  window.scrollTo(0, 0);
+  await SpecialPowers.spawn(iframe, [], async () => {
+    await content.wrappedJSObject.waitToClearOutAnyPotentialScrolls(content.window);
+  });
+  is(0, window.scrollY, "scroll position is reset");
+
+  SpecialPowers.spawn(iframe, [], async () => {
+    let textarea = content.document.querySelector("textarea");
+    textarea.setSelectionRange(textarea.value.length, textarea.value.length);
+  });
+
+  transformEndPromise = promiseTransformEnd();
+  await SpecialPowers.spawn(iframe, [], async () => {
+    SpecialPowers.DOMWindowUtils.zoomToFocusedInput();
+  });
+  await transformEndPromise;
+  await promiseApzFlushedRepaints();
+
+  ok(window.scrollY > 0, "scroll position isn't top");
+  iframeWindowScrollY = await SpecialPowers.spawn(iframe, [], () => {
+    return content.window.scrollY;
+  });
+  ok(iframeWindowScrollY > 0, "scroll position into iframe isn't top");
+  ok(prevPosY < window.scrollY,
+     "scroll position is different from first line of textarea");
+}
+
+waitUntilApzStable().then(test).then(subtestDone, subtestFailed);
+</script>
+</body>
+</html>