diff --git a/player/javascript/defaults.js b/player/javascript/defaults.js
index d85653bd3f..9694b852d7 100644
--- a/player/javascript/defaults.js
+++ b/player/javascript/defaults.js
@@ -170,6 +170,28 @@ mp.abort_async_command = function abort_async_command(id) {
         mp._abort_async_command(id);
 }
 
+// shared-script-properties - always an object, even if without properties
+function shared_script_property_set(name, val) {
+    if (arguments.length > 1)
+        return mp.commandv("change-list", "shared-script-properties", "append", "" + name + "=" + val);
+    else
+        return mp.commandv("change-list", "shared-script-properties", "remove", name);
+}
+
+function shared_script_property_get(name) {
+    return mp.get_property_native("shared-script-properties")[name];
+}
+
+function shared_script_property_observe(name, cb) {
+    return mp.observe_property("shared-script-properties", "native",
+        function shared_props_cb(_name, val) { cb(name, val[name]) }
+    );
+}
+
+mp.utils.shared_script_property_set = shared_script_property_set;
+mp.utils.shared_script_property_get = shared_script_property_get;
+mp.utils.shared_script_property_observe = shared_script_property_observe;
+
 /**********************************************************************
  *  key bindings
  *********************************************************************/