diff --git a/Tests/LibWeb/Text/expected/Streams/CountQueuingStrategy-enqueue-desired-size.txt b/Tests/LibWeb/Text/expected/Streams/CountQueuingStrategy-enqueue-desired-size.txt
new file mode 100644
index 0000000000..0a35a6c536
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Streams/CountQueuingStrategy-enqueue-desired-size.txt
@@ -0,0 +1,5 @@
+3
+2
+1
+0
+-1
diff --git a/Tests/LibWeb/Text/input/Streams/CountQueuingStrategy-enqueue-desired-size.html b/Tests/LibWeb/Text/input/Streams/CountQueuingStrategy-enqueue-desired-size.html
new file mode 100644
index 0000000000..925fb17e05
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Streams/CountQueuingStrategy-enqueue-desired-size.html
@@ -0,0 +1,24 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        let controller;
+        new ReadableStream(
+            {
+                start(c) {
+                    controller = c;
+                }
+            },
+            new CountQueuingStrategy({ highWaterMark: 3 })
+        );
+
+        println(controller.desiredSize);
+        controller.enqueue('Hello, friends!');
+        println(controller.desiredSize);
+        controller.enqueue('Enqueues being counted...');
+        println(controller.desiredSize);
+        controller.enqueue('By CountQueuingStrategy');
+        println(controller.desiredSize);
+        controller.enqueue('!');
+        println(controller.desiredSize);
+    });
+</script>