From 5a624fa1be530a1b3479a4cc7f96e5a20a3d64fb Mon Sep 17 00:00:00 2001
From: Pete Bacon Darwin <pete@bacondarwin.com>
Date: Fri, 2 Feb 2018 16:40:14 +0000
Subject: [PATCH] feat(aio): dynamically, pre-emptively, add `noindex` (#21992)

These tags are removed when the doc is ready and valid, but this will
allow us to block indexing in the case that the Angular app fails to
bootstrap or load the document for some non-404 reason.

This should get around the problem with hardcoded tags. See
https://github.com/angular/angular/commit/c3fb820473d64036ef0dd3d4c004cc7fbc67be75

Closes #21941

PR Close #21992
---
 aio/src/index.html | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/aio/src/index.html b/aio/src/index.html
index cfe04f2bb1..0a29f7dfb1 100644
--- a/aio/src/index.html
+++ b/aio/src/index.html
@@ -31,6 +31,14 @@
   <meta name="apple-mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="translucent">
 
+  <script>
+    // Dynamically, pre-emptively, add `noindex`, which will be removed when the doc is ready and valid
+    var tag = document.createElement('meta'); tag.name = 'googlebot'; tag.content = 'noindex';
+    document.head.appendChild(tag);
+    tag = document.createElement('meta'); tag.name = 'robots'; tag.content = 'noindex';
+    document.head.appendChild(tag);
+  </script>
+
   <!-- Google Analytics -->
   <script>
   // Note this is a customised version of the GA tracking snippet