5 files changed, 163 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-view-transitions/support/cat.png b/testing/web-platform/tests/css/css-view-transitions/support/cat.png
new file mode 100644
index 0000000000..85dd732481
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/support/cat.png
diff --git a/testing/web-platform/tests/css/css-view-transitions/support/dialog-in-rtl-iframe-child.html b/testing/web-platform/tests/css/css-view-transitions/support/dialog-in-rtl-iframe-child.html
new file mode 100644
index 0000000000..7b40a8fd5b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/support/dialog-in-rtl-iframe-child.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html dir="rtl">
+  <head>
+    <style>
+      body {
+        /* We need a background due to https://crbug.com/1414158. */
+        background-color: white;
+        height: 200vh;
+      }
+
+      ::view-transition-new(*) {
+        animation: unset;
+        opacity: 1;
+      }
+      ::view-transition-old(*) {
+        animation-duration: 30s;
+        opacity: 0;
+      }
+
+      dialog {
+        width: 50dvw;
+        height: 50dvh;
+        box-sizing: border-box;
+        background-color: limegreen;
+        border: 1px solid black;
+      }
+
+    </style>
+    <script>
+      function show() {
+        document.getElementById('dialog').showModal();
+      }
+      function startTransition() {
+        window.transition = document.startViewTransition(() => {
+          show();
+        });
+      }
+
+      const params = new URLSearchParams(window.location.search);
+      if (params.has('show')) {
+        addEventListener('load', show);
+      }
+    </script>
+  </head>
+  <body>
+    <dialog id="dialog">
+    </dialog>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/css-view-transitions/support/frame-helper.html b/testing/web-platform/tests/css/css-view-transitions/support/frame-helper.html
new file mode 100644
index 0000000000..3d2e7b52d0
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/support/frame-helper.html
@@ -0,0 +1,25 @@
+<!doctype html>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+html { height: 50%; }
+::view-transition-group(*) { animation-duration: 500s }
+</style>
+
+<div></div>
+
+<script>
+function run() {
+  document.startViewTransition(() => {
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      window.parent.postMessage({}, "*");
+    }));
+  });
+}
+onload = () => requestAnimationFrame(() => requestAnimationFrame(run));
+</script>
+
diff --git a/testing/web-platform/tests/css/css-view-transitions/support/iframe-scrollbar-child.html b/testing/web-platform/tests/css/css-view-transitions/support/iframe-scrollbar-child.html
new file mode 100644
index 0000000000..dfd0fb40d9
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/support/iframe-scrollbar-child.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body.scrollable {
+        width: 200lvw;
+        height: 200lvh;
+      }
+
+      div {
+        width: 200px;
+        height: 200px;
+        background-color: skyblue;
+      }
+
+      ::view-transition-new(*) {
+        animation-duration: 30s;
+        opacity: 0;
+      }
+      ::view-transition-old(*) {
+        animation: unset;
+        opacity: 1;
+      }
+      */
+    </style>
+    <script>
+      function startTransition() {
+        window.transition = document.startViewTransition(() => {
+          document.body.classList.toggle('scrollable');
+        });
+      }
+
+      onload = () => {
+        const params = new URLSearchParams(window.location.search);
+        if (params.has('scrollbar')) {
+          document.body.classList.add('scrollable');
+        }
+      }
+    </script>
+  </head>
+  <body>
+    <div></div>
+  </body>
+</html>
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>