1 files changed, 9 insertions, 0 deletions
diff --git a/dom/webidl/TaskPriorityChangeEvent.webidl b/dom/webidl/TaskPriorityChangeEvent.webidl
new file mode 100644
index 0000000000..1fc959ecb6
--- /dev/null
+++ b/dom/webidl/TaskPriorityChangeEvent.webidl
@@ -0,0 +1,9 @@
+[Exposed=(Window, Worker), Pref="dom.enable_web_task_scheduling"]
+interface TaskPriorityChangeEvent : Event {
+  constructor (DOMString type , TaskPriorityChangeEventInit priorityChangeEventInitDict);
+  readonly attribute TaskPriority previousPriority;
+};
+
+dictionary TaskPriorityChangeEventInit : EventInit {
+  required TaskPriority previousPriority;
+};