1 files changed, 30 insertions, 0 deletions
diff --git a/testing/web-platform/tests/storage/resources/partitioned-estimate-usage-details-service-workers-helper-frame.html b/testing/web-platform/tests/storage/resources/partitioned-estimate-usage-details-service-workers-helper-frame.html
new file mode 100644
index 0000000000..25d7554868
--- /dev/null
+++ b/testing/web-platform/tests/storage/resources/partitioned-estimate-usage-details-service-workers-helper-frame.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta name=help href="https://privacycg.github.io/storage-partitioning/">
+<title>Helper frame</title>
+
+<script>
+  const usageDetails = async () => {
+    return (await navigator.storage.estimate())
+      .usageDetails.serviceWorkerRegistrations || 0
+  }
+
+  let details = {};
+
+  window.addEventListener("message", async event => {
+    if (event.data === "get-details") {
+      details.source = "same-site";
+      details.init = await usageDetails();
+      event.source.postMessage(details, event.source.origin);
+    }
+  });
+
+  window.addEventListener("load", async () => {
+    if (parent.opener) {
+      details.source = "cross-site";
+      details.init = await usageDetails();
+      parent.opener.postMessage(details, parent.opener.origin);
+    }
+  });
+
+  window.parent.postMessage("iframe-is-ready", window.parent.origin);
+</script>