diff --git a/controller/internal/web/app_page_test.go b/controller/internal/web/app_page_test.go
index cb26ecb..991164d 100644
--- a/controller/internal/web/app_page_test.go
+++ b/controller/internal/web/app_page_test.go
@@ -583,3 +583,39 @@ func TestAppPage_EachTabRendersItsOwnContent(t *testing.T) {
 		}
 	}
 }
+
+// TestAppPage_ScriptTagsAreBalanced — every tab's rendered HTML closes every <script> it opens.
+//
+// THIS TEST EXISTS BECAUSE THE SUITE MISSED A DEAD PAGE. The log tab's body was lifted out of the
+// old logs.html by line range and the range stopped one line short, dropping `</script>`. Go's
+// html/template parsed it, the page rendered, and TestAppPage_EachTabRendersItsOwnContent found
+// `setInterval(window.fetchLogs` exactly where it expected it — because the TEXT was there. The
+// browser then refused the block with „SyntaxError: Unexpected token '<'" and the live log poller
+// never ran. A marker proves a string is present; it does not prove the browser will execute it.
+//
+// RED-PROOF (REPORT.md): delete the `</script>` from app_logs.html again → this fails naming the
+// logs tab. Reverted.
+func TestAppPage_ScriptTagsAreBalanced(t *testing.T) {
+	s := appPageHarness(t)
+	for _, p := range []string{
+		"/apps/adventurelog", "/apps/adventurelog/settings", "/apps/adventurelog/data",
+		"/apps/adventurelog/guide", "/apps/adventurelog/logs",
+		"/apps/grocy", "/apps/grocy/install",
+	} {
+		body := appGet(t, s, p).Body.String()
+		open := strings.Count(body, "<script")
+		closed := strings.Count(body, "</script>")
+		if open != closed {
+			t.Errorf("%s: %d <script> opened, %d closed — an unclosed block swallows the markup after it "+
+				"and the browser refuses the whole thing", p, open, closed)
+		}
+		// An unclosed block shows up as page markup INSIDE the script: the first thing after the
+		// last statement would be a tag rather than </script>.
+		if i := strings.LastIndex(body, "<script"); i >= 0 {
+			rest := body[i:]
+			if j := strings.Index(rest, "</script>"); j < 0 {
+				t.Errorf("%s: the last <script> is never closed", p)
+			}
+		}
+	}
+}
diff --git a/controller/internal/web/templates/app_logs.html b/controller/internal/web/templates/app_logs.html
index dd89474..68c8bbc 100644
--- a/controller/internal/web/templates/app_logs.html
+++ b/controller/internal/web/templates/app_logs.html
@@ -70,6 +70,7 @@
     container.scrollTop = container.scrollHeight;
     startPolling();
 })();
+</script>
 </div>
 
 {{template "layout_end" .}}
diff --git a/controller/internal/web/testdata/i18n_parity/app_logs.html b/controller/internal/web/testdata/i18n_parity/app_logs.html
index 08f1293..50a7093 100644
--- a/controller/internal/web/testdata/i18n_parity/app_logs.html
+++ b/controller/internal/web/testdata/i18n_parity/app_logs.html
@@ -289,6 +289,7 @@ line two</pre>
     container.scrollTop = container.scrollHeight;
     startPolling();
 })();
+</script>
 </div>