1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/resources/sw.js b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/resources/sw.js
new file mode 100644
index 0000000000..8bd079f790
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/resources/sw.js
@@ -0,0 +1,20 @@
+addEventListener('install', (event) => {
+  skipWaiting();
+});
+
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+async function broadcast(msg) {
+  const allClients = await clients.matchAll();
+  for (const client of allClients) {
+    client.postMessage(msg);
+  }
+}
+
+addEventListener('fetch', (event) => {
+  event.waitUntil(
+    broadcast({ url: event.request.url, mode: event.request.mode })
+  )
+});