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diff --git a/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html b/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html
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+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
+    <meta http-equiv="Pragma" content="no-cache" />
+    <meta http-equiv="Expires" content="0" />
+    <title>Network Observer missing service worker test page</title>
+  </head>
+
+  <body>
+    <p>Network Observer test page</p>
+    <script type="text/javascript">
+      /* exported registerServiceWorker */
+      "use strict";
+
+      function registerServiceWorker() {
+        const sw = navigator.serviceWorker;
+        // NOTE: This service worker file does not exist which enables testing
+        // that a 404 requests is received.
+        return sw.register("serviceworker-missing.js")
+          .then(registration => {
+            throw new Error("The Service Worker file should not exist");
+          }).catch(err => {
+            console.log("Registration failed as expected");
+          });
+      }
+    </script>
+  </body>
+</html>