diff --git a/AK/URL.cpp b/AK/URL.cpp
index eb7da264d15..06e21ae4b2b 100644
--- a/AK/URL.cpp
+++ b/AK/URL.cpp
@@ -204,22 +204,29 @@ bool URL::compute_validity() const
     return true;
 }
 
+// https://url.spec.whatwg.org/#default-port
 u16 URL::default_port_for_scheme(StringView scheme)
 {
+    // Spec defined mappings with port:
+    if (scheme == "ftp")
+        return 21;
     if (scheme == "http")
         return 80;
     if (scheme == "https")
         return 443;
+    if (scheme == "ws")
+        return 80;
+    if (scheme == "wss")
+        return 443;
+
+    // NOTE: not in spec, but we support these too
     if (scheme == "gemini")
         return 1965;
     if (scheme == "irc")
         return 6667;
     if (scheme == "ircs")
         return 6697;
-    if (scheme == "ws")
-        return 80;
-    if (scheme == "wss")
-        return 443;
+
     return 0;
 }
 
diff --git a/Tests/LibWeb/Text/expected/URL/url.txt b/Tests/LibWeb/Text/expected/URL/url.txt
new file mode 100644
index 00000000000..ae26759dc9c
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/URL/url.txt
@@ -0,0 +1,9 @@
+ftp://serenityos.org:21
+protocol => 'ftp:'
+username => ''
+password => ''
+host => 'serenityos.org'
+hostname => 'serenityos.org'
+port => ''
+pathname => '/'
+search => ''
diff --git a/Tests/LibWeb/Text/input/URL/url.html b/Tests/LibWeb/Text/input/URL/url.html
new file mode 100644
index 00000000000..c37a2ef030f
--- /dev/null
+++ b/Tests/LibWeb/Text/input/URL/url.html
@@ -0,0 +1,23 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        function printURL(input) {
+            println(input);
+            const url = new URL(input);
+            println(`protocol => '${url.protocol}'`);
+            println(`username => '${url.username}'`);
+            println(`password => '${url.password}'`);
+            println(`host => '${url.host}'`);
+            println(`hostname => '${url.hostname}'`);
+            println(`port => '${url.port}'`);
+            println(`pathname => '${url.pathname}'`);
+            println(`search => '${url.search}'`);
+        }
+
+        for (url of [
+            'ftp://serenityos.org:21',
+        ]) {
+            printURL(url);
+        }
+    });
+</script>