1 files changed, 72 insertions, 0 deletions
diff --git a/browser/base/content/test/fullscreen/browser_fullscreen_menus.js b/browser/base/content/test/fullscreen/browser_fullscreen_menus.js
new file mode 100644
index 0000000000..90dd06192d
--- /dev/null
+++ b/browser/base/content/test/fullscreen/browser_fullscreen_menus.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_shortcut_key_label_in_fullscreen_menu_item() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["full-screen-api.transition-duration.enter", "0 0"],
+      ["full-screen-api.transition-duration.leave", "0 0"],
+    ],
+  });
+
+  const isMac = AppConstants.platform == "macosx";
+  const shortCutKeyLabel = isMac ? "\u2303\u2318F" : "F11";
+  const enterMenuItemId = isMac ? "enterFullScreenItem" : "fullScreenItem";
+  const exitMenuItemId = isMac ? "exitFullScreenItem" : "fullScreenItem";
+  const accelKeyLabelSelector = ".menu-accel-container > label";
+
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "https://example.org/browser/browser/base/content/test/fullscreen/fullscreen.html"
+  );
+
+  await SimpleTest.promiseFocus(tab.linkedBrowser);
+
+  document.getElementById(enterMenuItemId).render();
+  Assert.equal(
+    document
+      .getElementById(enterMenuItemId)
+      .querySelector(accelKeyLabelSelector)
+      ?.getAttribute("value"),
+    shortCutKeyLabel,
+    `The menu item to enter into the fullscreen mode should show a shortcut key`
+  );
+
+  const fullScreenEntered = BrowserTestUtils.waitForEvent(window, "fullscreen");
+
+  EventUtils.synthesizeKey("KEY_F11", {});
+
+  info(`Waiting for entering the fullscreen mode...`);
+  await fullScreenEntered;
+
+  document.getElementById(exitMenuItemId).render();
+  Assert.equal(
+    document
+      .getElementById(exitMenuItemId)
+      .querySelector(accelKeyLabelSelector)
+      ?.getAttribute("value"),
+    shortCutKeyLabel,
+    `The menu item to exiting from the fullscreen mode should show a shortcut key`
+  );
+
+  const fullScreenExited = BrowserTestUtils.waitForEvent(window, "fullscreen");
+
+  EventUtils.synthesizeKey("KEY_F11", {});
+
+  info(`Waiting for exiting from the fullscreen mode...`);
+  await fullScreenExited;
+
+  document.getElementById(enterMenuItemId).render();
+  Assert.equal(
+    document
+      .getElementById(enterMenuItemId)
+      .querySelector(accelKeyLabelSelector)
+      ?.getAttribute("value"),
+    shortCutKeyLabel,
+    `After exiting from the fullscreen mode, the menu item to enter the fullscreen mode should show a shortcut key`
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});