1 files changed, 40 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_backButtonFitts.js b/browser/base/content/test/general/browser_backButtonFitts.js
new file mode 100644
index 0000000000..8ef3006a2c
--- /dev/null
+++ b/browser/base/content/test/general/browser_backButtonFitts.js
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+add_task(async function () {
+  let firstLocation =
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.org/browser/browser/base/content/test/general/dummy_page.html";
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, firstLocation);
+
+  await ContentTask.spawn(gBrowser.selectedBrowser, {}, async function () {
+    // Push the state before maximizing the window and clicking below.
+    content.history.pushState("page2", "page2", "page2");
+  });
+
+  window.maximize();
+
+  // Find where the nav-bar is vertically.
+  var navBar = document.getElementById("nav-bar");
+  var boundingRect = navBar.getBoundingClientRect();
+  var yPixel = boundingRect.top + Math.floor(boundingRect.height / 2);
+  var xPixel = 0; // Use the first pixel of the screen since it is maximized.
+
+  let popStatePromise = BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "popstate",
+    true
+  );
+  EventUtils.synthesizeMouseAtPoint(xPixel, yPixel, {}, window);
+  await popStatePromise;
+
+  is(
+    gBrowser.selectedBrowser.currentURI.spec,
+    firstLocation,
+    "Clicking the first pixel should have navigated back."
+  );
+  window.restore();
+
+  gBrowser.removeCurrentTab();
+});