1 files changed, 64 insertions, 0 deletions
diff --git a/browser/base/content/test/fullscreen/browser_fullscreen_cross_origin.js b/browser/base/content/test/fullscreen/browser_fullscreen_cross_origin.js
new file mode 100644
index 0000000000..0babb8b35e
--- /dev/null
+++ b/browser/base/content/test/fullscreen/browser_fullscreen_cross_origin.js
@@ -0,0 +1,64 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const ORIGIN =
+  "https://example.com/browser/browser/base/content/test/fullscreen/fullscreen_frame.html";
+
+add_task(async function test_fullscreen_cross_origin() {
+  async function requestFullscreen(aAllow, aExpect) {
+    await BrowserTestUtils.withNewTab(ORIGIN, async function (browser) {
+      const iframeId = aExpect == "allowed" ? "frameAllowed" : "frameDenied";
+
+      info("Start fullscreen on iframe " + iframeId);
+      await SpecialPowers.spawn(
+        browser,
+        [{ aExpect, iframeId }],
+        async function (args) {
+          let frame = content.document.getElementById(args.iframeId);
+          frame.focus();
+          await SpecialPowers.spawn(frame, [args.aExpect], async expect => {
+            let frameDoc = content.document;
+            const waitForFullscreen = new Promise(resolve => {
+              const message =
+                expect == "allowed" ? "fullscreenchange" : "fullscreenerror";
+              function handler(evt) {
+                frameDoc.removeEventListener(message, handler);
+                Assert.equal(evt.type, message, `Request should be ${expect}`);
+                frameDoc.exitFullscreen();
+                resolve();
+              }
+              frameDoc.addEventListener(message, handler);
+            });
+            frameDoc.getElementById("request").click();
+            await waitForFullscreen;
+          });
+        }
+      );
+
+      if (aExpect == "allowed") {
+        waitForFullScreenState(browser, false);
+      }
+    });
+  }
+
+  await new Promise(r => {
+    SpecialPowers.pushPrefEnv(
+      {
+        set: [
+          ["full-screen-api.enabled", true],
+          ["full-screen-api.allow-trusted-requests-only", false],
+          ["full-screen-api.transition-duration.enter", "0 0"],
+          ["full-screen-api.transition-duration.leave", "0 0"],
+          ["dom.security.featurePolicy.header.enabled", true],
+          ["dom.security.featurePolicy.webidl.enabled", true],
+        ],
+      },
+      r
+    );
+  });
+
+  await requestFullscreen(undefined, "denied");
+  await requestFullscreen("fullscreen", "allowed");
+});