1 files changed, 14 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/stale-while-revalidate/sw-intercept.js b/testing/web-platform/tests/fetch/stale-while-revalidate/sw-intercept.js
new file mode 100644
index 0000000000..dca7de51b0
--- /dev/null
+++ b/testing/web-platform/tests/fetch/stale-while-revalidate/sw-intercept.js
@@ -0,0 +1,14 @@
+async function broadcast(msg) {
+  for (const client of await clients.matchAll()) {
+    client.postMessage(msg);
+  }
+}
+
+self.addEventListener('fetch', event => {
+  event.waitUntil(broadcast(event.request.url));
+  event.respondWith(fetch(event.request));
+});
+
+self.addEventListener('activate', event => {
+  self.clients.claim();
+});