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diff --git a/testing/web-platform/tests/infrastructure/assumptions/non-local-ports.sub.window.js b/testing/web-platform/tests/infrastructure/assumptions/non-local-ports.sub.window.js
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+// Verifies that non-local HTTP(S) ports are open and serve correctly.
+//
+// See the corresponding WPT RFC:
+// https://github.com/web-platform-tests/rfcs/blob/master/rfcs/address_space_overrides.md
+//
+// These ports are used to test the Private Network Access specification:
+// https://wicg.github.io/private-network-access/
+//
+// More tests can be found in `fetch/private-network-access/`.
+
+const alternatePorts = {
+  httpPrivate:  "{{ports[http-private][0]}}",
+  httpsPrivate: "{{ports[https-private][0]}}",
+  httpPublic:   "{{ports[http-public][0]}}",
+  httpsPublic:  "{{ports[https-public][0]}}",
+};
+
+// Resolves a URL relative to the current location, returning an absolute URL.
+//
+// `url` specifies the relative URL, e.g. "foo.html" or "http://foo.example".
+// `options.protocol` and `options.port`, if defined, override the respective
+// properties of the returned URL object.
+function resolveUrl(url, options) {
+  const result = new URL(url, window.location);
+  if (options === undefined) {
+    return result;
+  }
+
+  const { port, protocol } = options;
+  if (port !== undefined) {
+    result.port = port;
+  }
+  if (protocol !== undefined) {
+    result.protocol = protocol;
+  }
+
+  return result;
+}
+
+const alternateOrigins = {
+  httpPrivate: {
+    protocol: "http:",
+    port: alternatePorts.httpPrivate,
+  },
+  httpsPrivate: {
+    protocol: "https:",
+    port: alternatePorts.httpsPrivate,
+  },
+  httpPublic: {
+    protocol: "http:",
+    port: alternatePorts.httpPublic,
+  },
+  httpsPublic: {
+    protocol: "https:",
+    port: alternatePorts.httpsPublic,
+  },
+};
+
+promise_test(async () => {
+  const url =
+    resolveUrl("/common/blank-with-cors.html", alternateOrigins.httpsPrivate);
+  const response = await fetch(url);
+  assert_true(response.ok);
+}, "Fetch from https-private port works.");
+
+promise_test(async () => {
+  const url =
+    resolveUrl("/common/blank-with-cors.html", alternateOrigins.httpPrivate);
+  const response = await fetch(url);
+  assert_true(response.ok);
+}, "Fetch from http-private port works.");
+
+promise_test(async () => {
+  const url =
+    resolveUrl("/common/blank-with-cors.html", alternateOrigins.httpsPublic);
+  const response = await fetch(url);
+  assert_true(response.ok);
+}, "Fetch from https-public port works.");
+
+promise_test(async () => {
+  const url =
+    resolveUrl("/common/blank-with-cors.html", alternateOrigins.httpPublic);
+  const response = await fetch(url);
+  assert_true(response.ok);
+}, "Fetch from http-public port works.");
+
+promise_test(async (t) => {
+  const futureMessage = new Promise((resolve) => {
+    window.addEventListener("message", resolve);
+  });
+
+  const iframe = await new Promise((resolve, reject) => {
+    const iframe = document.createElement("iframe");
+    iframe.src = resolveUrl("resources/fetch-and-post-result.html",
+                            alternateOrigins.httpPublic);
+
+    iframe.onload = () => { resolve(iframe); };
+    iframe.onerror = reject;
+
+    document.body.appendChild(iframe);
+    t.add_cleanup(() => {
+      document.body.removeChild(iframe);
+    });
+  });
+
+  iframe.contentWindow.postMessage(
+    resolveUrl("/common/blank-with-cors.html").toString(), "*");
+
+  const evt = await futureMessage;
+  assert_equals(evt.data, "failure: error = TypeError");
+}, "Fetch from http-public to local http fails.");