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diff --git a/testing/web-platform/tests/css/css-view-transitions/only-child-old.html b/testing/web-platform/tests/css/css-view-transitions/only-child-old.html
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index 0000000000..7a55af7397
--- /dev/null
+++ b/testing/web-platform/tests/css/css-view-transitions/only-child-old.html
@@ -0,0 +1,171 @@
+<!DOCTYPE html>
+<html class="reftest-wait foo">
+<title>View transitions: ensure :only-child is supported on view-transition-old</title>
+<link rel="help" href="https://github.com/WICG/view-transitions">
+<link rel="author" href="mailto:khushalsagar@chromium.org">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+::view-transition {
+  background-color: black;
+}
+html:only-child {
+  background-color: black;
+}
+:root:only-child {
+  background-color: black;
+}
+:only-child {
+  background-color: black;
+}
+.foo:only-child {
+  background-color: black;
+}
+
+::view-transition-old(root) {
+  background-color: blue;
+}
+::view-transition-old(target) {
+  background-color: blue;
+}
+::view-transition-old(*) {
+  color: blue;
+}
+
+::view-transition-old(root):only-child {
+  background-color: red;
+}
+::view-transition-old(target):only-child {
+  background-color: red;
+}
+::view-transition-old(*):only-child {
+  color: red;
+}
+
+</style>
+<div id="target"></div>
+
+<script>
+let matchedColor = "rgb(255, 0, 0)";
+let notMatchedColor = "rgb(0, 0, 255)";
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    document.documentElement.style.viewTransitionName = "root";
+    target.style.viewTransitionName = "none";
+    let transition = document.startViewTransition(() => {
+      document.documentElement.style.viewTransitionName = "none";
+    });
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(root)");
+      if (style.backgroundColor == matchedColor && style.color == matchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should match because ::view-transition-new is not generated (root to none)");
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    document.documentElement.style.viewTransitionName = "root";
+    target.style.viewTransitionName = "none";
+    let transition = document.startViewTransition();
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(root)");
+      if (style.backgroundColor == notMatchedColor && style.color == notMatchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should not match because ::view-transition-new is generated (root to root)");
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    document.documentElement.style.viewTransitionName = "root";
+    target.style.viewTransitionName = "none";
+    let transition = document.startViewTransition(() => {
+      document.documentElement.style.viewTransitionName = "none";
+      target.style.viewTransitionName = "root";
+    });
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(root)");
+      if (style.backgroundColor == notMatchedColor && style.color == notMatchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should not match because ::view-transition-new is generated (root to element)");
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    target.style.viewTransitionName = "target";
+    document.documentElement.style.viewTransitionName = "none";
+    let transition = document.startViewTransition(() => {
+      target.style.viewTransitionName = "none";
+    });
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(target)");
+      if (style.backgroundColor == matchedColor && style.color == matchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should match because ::view-transition-new is not generated (element to none)");
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    target.style.viewTransitionName = "root";
+    document.documentElement.style.viewTransitionName = "none";
+    let transition = document.startViewTransition(() => {
+      document.documentElement.style.viewTransitionName = "root";
+      target.style.viewTransitionName = "none";
+    });
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(root)");
+      if (style.backgroundColor == notMatchedColor && style.color == notMatchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should not match because ::view-transition-new is generated (element to root)");
+
+promise_test(() => {
+  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+  return new Promise(async (resolve, reject) => {
+    target.style.viewTransitionName = "target";
+    document.documentElement.style.viewTransitionName = "none";
+    let transition = document.startViewTransition();
+
+    transition.ready.then(() => {
+      let style = getComputedStyle(
+        document.documentElement, ":view-transition-old(target)");
+      if (style.backgroundColor == notMatchedColor && style.color == notMatchedColor)
+        resolve();
+      else
+        reject(style.backgroundColor + " and " + style.color);
+    });
+  });
+}, ":only-child should not match because ::view-transition-new is generated (element to element)");
+</script>