1 files changed, 28 insertions, 0 deletions
diff --git a/dom/serviceworkers/test/sw_with_navigationPreload.js b/dom/serviceworkers/test/sw_with_navigationPreload.js
new file mode 100644
index 0000000000..afd7181dcf
--- /dev/null
+++ b/dom/serviceworkers/test/sw_with_navigationPreload.js
@@ -0,0 +1,28 @@
+addEventListener("activate", event => {
+  event.waitUntil(self.registration.navigationPreload.enable());
+});
+
+async function post_to_page(data) {
+  let cs = await self.clients.matchAll();
+  for (const client of cs) {
+    client.postMessage(data);
+  }
+}
+
+addEventListener("fetch", event => {
+  if (event.request.url.includes("navigationPreload_page.html")) {
+    event.respondWith(
+      new Response("<!DOCTYPE html>", {
+        headers: { "Content-Type": "text/html; charset=utf-8" },
+      })
+    );
+
+    event.waitUntil(
+      (async function () {
+        let preloadResponse = await event.preloadResponse;
+        let text = await preloadResponse.text();
+        await post_to_page(text);
+      })()
+    );
+  }
+});