diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-manual.tentative.html b/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-manual.tentative.html
new file mode 100644
index 0000000000000..fa9c958e0e4ba
--- /dev/null
+++ b/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-manual.tentative.html
@@ -0,0 +1,34 @@
+
+
+
+
+
+ Protocol Handling Web Platform Test
+
+
+
+
Protocol Handling Web Platform Test
+
This test validates that an install application can register URL protocol
+ handlers via a property in the web app manifest. The app should open
+ directly when the 'web+testing' custom-scheme URL is visited.
+
+
Manual Test Steps:
+
+
+
Install this app.
+
Launch 'web+testing://test-url/'. Instructions will vary by OS.
+
+
On Windows - open a command prompt, and run "start web+testing://test-url/".
+
On MacOS - open a terminal, and "open web+testing://test-url/".
+
On Linux - open a terminal, and "xgd-open web+testing://test-url/".
+
+
+
If your browser prompts you, allow the app to open.
+
The app window that opens should indicate success of this test.
+
+
+
+
\ No newline at end of file
diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-service-worker.js b/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-service-worker.js
new file mode 100644
index 0000000000000..e502e2a9859f6
--- /dev/null
+++ b/testing/web-platform/tests/appmanifest/protocol_handlers-member/protocol_handlers-member-service-worker.js
@@ -0,0 +1,52 @@
+// Some user agents only offer app installation if there is a SW and it handles
+// offline requests.
+
+const cacheVersion = "1.1";
+const CACHE_NAME = `cache-v${cacheVersion}`;
+
+// The resources cached by this service worker.
+const resources = [
+ "protocol_handlers-member-service-worker.js",
+ "protocol_handlers-member-manual.tentative.html",
+ "resources/icon.png",
+ "resources/protocol_handlers_entry.html",
+];
+
+// Load all resources for this service worker.
+const precache = async () => {
+ const cache = await caches.open(CACHE_NAME);
+ await cache.addAll(resources);
+};
+
+// Get a resource from the cache.
+const fromCache = async request => {
+ const cache = await caches.open(CACHE_NAME);
+ return await cache.match(request.url);
+};
+
+// Attempt to get resources from the network first, fallback to the cache if we're
+// offline.
+const networkFallbackToCache = async request => {
+ try {
+ const response = await fetch(request);
+ if (response.ok) return response;
+ } catch (err) {}
+ return await fromCache(request);
+};
+
+// When we have a new service worker, update the caches and swap immediately.
+self.addEventListener("install", e => {
+ e.waitUntil(precache().then(() => self.skipWaiting()));
+});
+
+// Claim existing clients.
+self.addEventListener("activate", e => {
+ e.waitUntil(self.clients.claim());
+});
+
+// When a resource need to be fetched, check whether it is
+// contained in the cache and return the cached version, otherwise
+// get it from the network.
+self.addEventListener("fetch", e => {
+ e.respondWith(networkFallbackToCache(e.request));
+});
diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/icon.png b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/icon.png
new file mode 100644
index 0000000000000..9255547fae087
Binary files /dev/null and b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/icon.png differ
diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest
new file mode 100644
index 0000000000000..cce6ae1e22b78
--- /dev/null
+++ b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest
@@ -0,0 +1,18 @@
+{
+ "name": "Protocol_handlers test",
+ "icons": [
+ {
+ "src": "icon.png",
+ "sizes": "144x144"
+ }
+ ],
+ "start_url": "../protocol_handlers-member-manual.tentative.html",
+ "display": "standalone",
+ "scope": "../../protocol_handlers-member/",
+ "protocol_handlers": [
+ {
+ "protocol": "web+testing",
+ "url": "protocol_handlers_entry.html?value=%s"
+ }
+ ]
+}
\ No newline at end of file
diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest.headers b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest.headers
new file mode 100644
index 0000000000000..2bab061d43ab9
--- /dev/null
+++ b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers-member.webmanifest.headers
@@ -0,0 +1 @@
+Content-Type: application/manifest+json; charset=utf-8
diff --git a/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers_entry.html b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers_entry.html
new file mode 100644
index 0000000000000..c5fa629f22bfd
--- /dev/null
+++ b/testing/web-platform/tests/appmanifest/protocol_handlers-member/resources/protocol_handlers_entry.html
@@ -0,0 +1,19 @@
+
+
+
+
+ Protocol Handling Web Platform Test - Pass
+
+
+
+
+
+
Protocol Handling Page
+
This test validates that the app was launched with the web+testing://test-url/ URL.