1 files changed, 12 insertions, 0 deletions
diff --git a/testing/web-platform/tests/event-timing/resources/event-timing-test-utils.js b/testing/web-platform/tests/event-timing/resources/event-timing-test-utils.js
index 9670d8d26f..7b281a4e0e 100644
--- a/testing/web-platform/tests/event-timing/resources/event-timing-test-utils.js
+++ b/testing/web-platform/tests/event-timing/resources/event-timing-test-utils.js
@@ -357,6 +357,13 @@ async function pointerdown(target) {
     .send();
 }
 
+async function pointerup(target) {
+  const actions = new test_driver.Actions();
+  return actions.addPointer("mousePointer", "mouse")
+    .pointerMove(0, 0, { origin: target })
+    .pointerUp()
+    .send();
+}
 async function auxPointerdown(target) {
   const actions = new test_driver.Actions();
   return actions.addPointer("mousePointer", "mouse")
@@ -443,6 +450,11 @@ async function interactAndObserve(interactionType, target, observerPromise) {
       interactionPromise = Promise.all([auxPointerdown(target), pointerdown(target)]);
       break;
     }
+    case 'orphan-pointerup': {
+      addListeners(target, ['pointerup']);
+      interactionPromise = pointerup(target);
+      break;
+    }
   }
   return Promise.all([interactionPromise, observerPromise]);
 }