Issue 1770 - Don't use shadow DOM on docs.google.com, fixing printing there

include.preload.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 136 matching lines @@
         }
       }
     );
   });
 
   observer.observe(style.parentNode, {childList: true});
 }
 
 function init(document)
 {
-  // use Shadow DOM if available to don't mess with web pages that
-  // rely on the order of their own <style> tags (#309). However we
-  // must not create the shadow root in the response callback passed
-  // to sendMessage(), otherwise Chrome breaks some websites (#450).
+  // Use Shadow DOM if available to don't mess with web pages that rely on
+  // the order of their own <style> tags (#309).
+  //
+  // However, creating a shadow root breaks running CSS transitions. So we
+  // have to create the shadow root before transistions might start (#452).
+  //
+  // Also, we can't use shadow DOM on Google Docs, since it breaks printing
+  // there (#1770).
   var shadow = null;
-  if ("createShadowRoot" in document.documentElement)
+  if ("createShadowRoot" in document.documentElement && document.domain != "docs.google.com")
   {
     shadow = document.documentElement.createShadowRoot();
     shadow.appendChild(document.createElement("shadow"));
   }
 
   // Sets the currently used CSS rules for elemhide filters
   var setElemhideCSSRules = function(selectors)
   {
     if (selectors.length == 0)
       return;
@@ skipping 65 matching lines @@
   }, true);
 
   ext.backgroundPage.sendMessage({type: "get-selectors"}, setElemhideCSSRules);
 }
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
   init(document);
 }