1 files changed, 49 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html
new file mode 100644
index 0000000000..810eeac9af
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/moveBefore/tentative/fullscreen-preserve.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Document#fullscreenElement</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/fullscreen/trusted-click.js"></script>
+<section id="old_parent">
+    <div id="item"></div>
+</section>
+<section id="new_parent">
+    <div id="item"></div>
+</section>
+<script>
+    promise_test(async function (t) {
+        const item = document.querySelector("#item");
+
+        await trusted_click();
+
+        assert_equals(
+            document.fullscreenElement,
+            null,
+            "fullscreenElement before requestFullscreen()"
+        );
+
+        await item.requestFullscreen();
+        assert_equals(
+            document.fullscreenElement,
+            item,
+            "fullscreenElement before moveBefore()"
+        );
+
+        document.querySelector("#new_parent").moveBefore(item, null);
+
+        assert_equals(
+            document.fullscreenElement,
+            item,
+            "fullscreenElement after moveBefore()"
+        );
+
+        await Promise.all([document.exitFullscreen(), fullScreenChange()]);
+
+        assert_equals(
+            document.fullscreenElement,
+            null,
+            "fullscreenElement after exiting fullscreen"
+        );
+    });
+</script>