Issue 1703 - Work around Chrome bug 442107, hiding placeholders in frames with javascript: URL

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 139 matching lines @@
         }
       }
     );
   });
 
   observer.observe(style.parentNode, {childList: true});
 }
 
 function init(document)
 {
-  // prior to Chrome 37, content scripts don't run on about:blank
-  // and about:srcdoc. So we have to apply element hiding and collapsing
-  // from the parent frame, when inline frames are loaded.
-  var match = navigator.userAgent.match(/\bChrome\/(\d+)/);
-  var fixInlineFrames = match && parseInt(match[1], 10) < 37;
-
   // 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).
   var shadow = null;
   if ("createShadowRoot" in document.documentElement)
   {
     shadow = document.documentElement.createShadowRoot();
     shadow.appendChild(document.createElement("shadow"));
   }
@@ skipping 50 matching lines @@
     checkCollapse(event.target);
   }, true);
 
   document.addEventListener("load", function(event)
   {
     var element = event.target;
 
     if (/^i?frame$/.test(element.localName))
       checkCollapse(element);
 
-    if (fixInlineFrames && isInlineFrame(element))
+    // prior to Chrome 37, content scripts cannot run on about:blank,
+    // about:srcdoc and javascript: URLs. Moreover, as of Chrome 40
+    // "load" and "error" events aren't dispatched there. So we have
+    // to apply element hiding and collapsing from the parent frame.
+    if (/\bChrome\//.test(navigator.userAgent) && isInlineFrame(element))
     {
       init(element.contentDocument);
 
       for (var tagName in typeMap)
         Array.prototype.forEach.call(element.contentDocument.getElementsByTagName(tagName), checkCollapse);
     }
   }, true);
 
   ext.backgroundPage.sendMessage({type: "get-selectors"}, setElemhideCSSRules);
 }
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
   init(document);
 }