Own browser UI sessions and shared navigation

test/browser-apps/ui-lifecycle/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>Browser UI lifecycle fixture</title>
+    </head>
+    <body>
+        <iframe id="owner-a" title="Owner A"></iframe>
+        <iframe id="owner-b" title="Owner B"></iframe>
+        <iframe id="owner-c" title="Owner C"></iframe>
+        <iframe id="owner-d" title="Owner D"></iframe>
+        <script type="module" src="/src/main.ts"></script>
+    </body>
+</html>