Parse meta tag that disables ChromeVox content script and forces compat mode.

chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
index e22cfc8adbbfbb57311f9dab2b08b38c3057ada3..f547f3c77eec6d7b2bf4c553441f4ce020556c34 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_document.js
@@ -83,6 +83,28 @@ cvox.ChromeVox.initDocument = function() {
     return;
   }
 
+  // Look for ChromeVox-specific meta attributes.
+  var disableContentScript = false;
+  if (document.head) {
+    document.head.querySelectorAll('meta[name="chromevox"]').forEach(
+      function(meta) {
+        var contentScript = meta.getAttribute('content-script');
+        if (contentScript && contentScript.toLowerCase() == 'no') {
+          disableContentScript = true;
+        }
+      });
+  }
+  if (disableContentScript) {
+    var url = location.href;
+    url = url.substring(0, url.indexOf('#')) || url;
+    cvox.ExtensionBridge.send({
+      target: 'next',
+      action: 'enableCompatForUrl',
+      url: url
+    });
+    return;
+  }
+
   cvox.ExtensionBridge.send({
     target: 'next',
     action: 'getIsClassicEnabled',