1 files changed, 112 insertions, 0 deletions
diff --git a/browser/base/content/test/fullscreen/browser_fullscreen_keydown_reservation.js b/browser/base/content/test/fullscreen/browser_fullscreen_keydown_reservation.js
new file mode 100644
index 0000000000..2d34ac6c7b
--- /dev/null
+++ b/browser/base/content/test/fullscreen/browser_fullscreen_keydown_reservation.js
@@ -0,0 +1,112 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// This test verifies that whether shortcut keys of toggling fullscreen modes
+// are reserved.
+add_task(async function test_keydown_event_reservation_toggling_fullscreen() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["full-screen-api.transition-duration.enter", "0 0"],
+      ["full-screen-api.transition-duration.leave", "0 0"],
+    ],
+  });
+
+  let shortcutKeys = [{ key: "KEY_F11", modifiers: {} }];
+  if (navigator.platform.startsWith("Mac")) {
+    shortcutKeys.push({
+      key: "f",
+      modifiers: { metaKey: true, ctrlKey: true },
+    });
+    shortcutKeys.push({
+      key: "F",
+      modifiers: { metaKey: true, shiftKey: true },
+    });
+  }
+  function shortcutDescription(aShortcutKey) {
+    return `${
+      aShortcutKey.metaKey ? "Meta + " : ""
+    }${aShortcutKey.shiftKey ? "Shift + " : ""}${aShortcutKey.ctrlKey ? "Ctrl + " : ""}${aShortcutKey.key.replace("KEY_", "")}`;
+  }
+  for (const shortcutKey of shortcutKeys) {
+    const tab = await BrowserTestUtils.openNewForegroundTab(
+      gBrowser,
+      "https://example.org/browser/browser/base/content/test/fullscreen/fullscreen.html"
+    );
+
+    await SimpleTest.promiseFocus(tab.linkedBrowser);
+
+    const fullScreenEntered = BrowserTestUtils.waitForEvent(
+      window,
+      "fullscreen"
+    );
+
+    await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+      content.wrappedJSObject.keydown = null;
+      content.window.addEventListener("keydown", event => {
+        switch (event.key) {
+          case "Shift":
+          case "Meta":
+          case "Control":
+            break;
+          default:
+            content.wrappedJSObject.keydown = event;
+        }
+      });
+    });
+
+    EventUtils.synthesizeKey(shortcutKey.key, shortcutKey.modifiers);
+
+    info(
+      `Waiting for entering the fullscreen mode with synthesizing ${shortcutDescription(
+        shortcutKey
+      )}...`
+    );
+    await fullScreenEntered;
+
+    info("Retrieving the result...");
+    Assert.ok(
+      await SpecialPowers.spawn(
+        tab.linkedBrowser,
+        [],
+        async () => !!content.wrappedJSObject.keydown
+      ),
+      `Entering the fullscreen mode with ${shortcutDescription(
+        shortcutKey
+      )} should cause "keydown" event`
+    );
+
+    const fullScreenExited = BrowserTestUtils.waitForEvent(
+      window,
+      "fullscreen"
+    );
+
+    await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+      content.wrappedJSObject.keydown = null;
+    });
+
+    EventUtils.synthesizeKey(shortcutKey.key, shortcutKey.modifiers);
+
+    info(
+      `Waiting for exiting from the fullscreen mode with synthesizing ${shortcutDescription(
+        shortcutKey
+      )}...`
+    );
+    await fullScreenExited;
+
+    info("Retrieving the result...");
+    Assert.ok(
+      await SpecialPowers.spawn(
+        tab.linkedBrowser,
+        [],
+        async () => !content.wrappedJSObject.keydown
+      ),
+      `Exiting from the fullscreen mode with ${shortcutDescription(
+        shortcutKey
+      )} should not cause "keydown" event`
+    );
+
+    BrowserTestUtils.removeTab(tab);
+  }
+});