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diff --git a/testing/web-platform/tests/interfaces/scheduling-apis.idl b/testing/web-platform/tests/interfaces/scheduling-apis.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Prioritized Task Scheduling (https://wicg.github.io/scheduling-apis/)
+
+enum TaskPriority {
+  "user-blocking",
+  "user-visible",
+  "background"
+};
+
+dictionary SchedulerPostTaskOptions {
+  AbortSignal signal;
+  TaskPriority priority;
+  [EnforceRange] unsigned long long delay = 0;
+};
+
+callback SchedulerPostTaskCallback = any ();
+
+[Exposed=(Window, Worker)]
+interface Scheduler {
+  Promise<any> postTask(SchedulerPostTaskCallback callback,
+                        optional SchedulerPostTaskOptions options = {});
+};
+
+[Exposed=(Window, Worker)]
+interface TaskPriorityChangeEvent : Event {
+  constructor(DOMString type, TaskPriorityChangeEventInit priorityChangeEventInitDict);
+
+  readonly attribute TaskPriority previousPriority;
+};
+
+dictionary TaskPriorityChangeEventInit : EventInit {
+  required TaskPriority previousPriority;
+};
+
+dictionary TaskControllerInit {
+  TaskPriority priority = "user-visible";
+};
+
+[Exposed=(Window,Worker)]
+interface TaskController : AbortController {
+  constructor(optional TaskControllerInit init = {});
+
+  undefined setPriority(TaskPriority priority);
+};
+
+[Exposed=(Window, Worker)]
+interface TaskSignal : AbortSignal {
+  readonly attribute TaskPriority priority;
+
+  attribute EventHandler onprioritychange;
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [Replaceable] readonly attribute Scheduler scheduler;
+};