JavaScript that returns whether or not a page is an article

components/dom_distiller/core/javascript/is_distillable_trigger.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function() {
+  var elems = document.querySelectorAll(
+      'meta[property="og:type"],meta[name=\\"og:type\\"]');
+  for (var i in elems) {
+    if (elems[i].content && elems[i].content.toUpperCase() == 'ARTICLE') {
+      return true;
+    }
+  }
+  var elems = document.querySelectorAll(
+      '*[itemtype="http://schema.org/Article"]');
+  for (var i in elems) {
+    if (elems[i].itemscope) {
+      return true;
+    }
+  }
+  return false;
+})()