diff --git a/test.html b/test.html
index 7100bae..45a8f0c 100644
--- a/test.html
+++ b/test.html
@@ -54,19 +54,28 @@
 </div>
 
 <script>
+function check(tab) {
+    const tabs = tab.split('/')
+    let path = 'tab'
+    for (tab of tabs) {
+        path = `${path}/${tab}`
+        document.getElementById(path).checked = true
+    }
+}
+function push(tab) {
+    const tb = tab.split('/').slice(1).join('/')
+    window.history.pushState(null, null, `?tab=${tb}`)
+}
 function update(id) {
-    let tabs = id.split('/').slice(1)
-    window.history.pushState(null, null, `?tab=${tabs.join('/')}`)
+    push(id)
 }
 function main() {
-    let tab = (new URL(document.location)).searchParams.get('tab')
+    const tab = (new URL(document.location)).searchParams.get('tab')
     if (tab) {
-        let path = 'tab'
-        let tabs = tab.split('/')
-        for (tab of tabs) {
-            path = `${path}/${tab}`
-            document.getElementById(path).checked = true
-        }
+        check(tab)
+    } else {
+        check('1/1')
+        push('tab/1/1')
     }
 }
 </script>