1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-view-transitions/support/transition-in-empty-iframe-child.html b/testing/web-platform/tests/css/css-view-transitions/support/transition-in-empty-iframe-child.html
new file mode 100644
index 0000000000..4eca06a0a9
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/support/transition-in-empty-iframe-child.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      ::view-transition-new(*) {
+        animation: unset;
+        opacity: 1;
+      }
+      ::view-transition-old(*) {
+        animation-duration: 30s;
+        opacity: 0;
+      }
+
+      div {
+        width: 50vw;
+        height: 50vh;
+        background-color: limegreen;
+        border: 1px solid black;
+      }
+
+      .hidden {
+        display: none;
+      }
+
+    </style>
+    <script>
+      function newState() {
+        document.querySelector('.hidden').classList.remove('hidden');
+      }
+
+      function startTransition() {
+        window.transition = document.startViewTransition(newState);
+      }
+
+      const params = new URLSearchParams(window.location.search);
+      if (params.has('ref')) {
+        addEventListener('load', newState);
+      }
+    </script>
+  </head>
+  <body>
+    <div class="hidden">
+    </div>
+  </body>
+</html>