1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_suspend_videos_outside_viewport.js b/toolkit/content/tests/browser/browser_suspend_videos_outside_viewport.js
new file mode 100644
index 0000000000..e36f1c75b8
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_suspend_videos_outside_viewport.js
@@ -0,0 +1,39 @@
+/**
+ * This test is used to ensure we suspend video decoding if video is not in the
+ * viewport.
+ */
+"use strict";
+
+const PAGE =
+  "https://example.com/browser/toolkit/content/tests/browser/file_outside_viewport_videos.html";
+
+async function test_suspend_video_decoding() {
+  let videos = content.document.getElementsByTagName("video");
+  for (let video of videos) {
+    info(`- start video on the ${video.id} side and outside the viewport -`);
+    await video.play();
+    ok(true, `video started playing`);
+    ok(video.isVideoDecodingSuspended, `video decoding is suspended`);
+  }
+}
+
+add_task(async function setup_test_preference() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["media.suspend-background-video.enabled", true],
+      ["media.suspend-background-video.delay-ms", 0],
+    ],
+  });
+});
+
+add_task(async function start_test() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: PAGE,
+    },
+    async browser => {
+      await SpecialPowers.spawn(browser, [], test_suspend_video_decoding);
+    }
+  );
+});