diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index 7338550993..f1d9889985 100644
Binary files a/resources/compiled_coffeescript.zip and b/resources/compiled_coffeescript.zip differ
diff --git a/src/calibre/ebooks/oeb/display/utils.coffee b/src/calibre/ebooks/oeb/display/utils.coffee
index 9891e6ed58..31763f10bd 100644
--- a/src/calibre/ebooks/oeb/display/utils.coffee
+++ b/src/calibre/ebooks/oeb/display/utils.coffee
@@ -136,6 +136,16 @@ class CalibreUtils
 
     # }}}
 
+    setup_epub_reading_system: (name, version, layout, features) ->  # {{{
+        window.navigator.epubReadingSystem = {
+            'name':name, 'version':version, 'layoutStyle':layout,
+            'hasFeature': (feature, version=1.0) ->
+                if (version == null or version == 1.0) and feature.toLowerCase() in features
+                    return true
+                return false
+        }
+    # }}}
+
 if window?
     window.calibre_utils = new CalibreUtils()
 
diff --git a/src/calibre/gui2/viewer/documentview.py b/src/calibre/gui2/viewer/documentview.py
index 4443e04f66..1487fd8686 100644
--- a/src/calibre/gui2/viewer/documentview.py
+++ b/src/calibre/gui2/viewer/documentview.py
@@ -7,6 +7,7 @@ __docformat__ = 'restructuredtext en'
 import os, math, json
 from base64 import b64encode
 from functools import partial
+from future_builtins import map
 
 from PyQt5.Qt import (
     QSize, QSizePolicy, QUrl, Qt, pyqtProperty, QPainter, QPalette, QBrush,
@@ -30,7 +31,7 @@ from calibre.gui2.viewer.inspector import WebInspector
 from calibre.gui2.viewer.gestures import GestureHandler
 from calibre.gui2.viewer.footnote import Footnotes
 from calibre.ebooks.oeb.display.webview import load_html
-from calibre.constants import isxp, iswindows, DEBUG
+from calibre.constants import isxp, iswindows, DEBUG, __version__
 # }}}
 
 def apply_settings(settings, opts):
@@ -207,6 +208,9 @@ class Document(QWebPage):  # {{{
         evaljs = self.mainFrame().evaluateJavaScript
         self.loaded_lang = self.js_loader(evaljs, self.current_language,
                 self.hyphenate_default_lang)
+        evaljs('window.calibre_utils.setup_epub_reading_system(%s, %s, %s, %s)' % tuple(map(json.dumps, (
+            'calibre-desktop', __version__, 'paginated' if self.in_paged_mode else 'scrolling',
+            'dom-manipulation layout-changes mouse-events keyboard-events'.split()))))
         mjpath = P(u'viewer/mathjax').replace(os.sep, '/')
         if iswindows:
             mjpath = u'/' + mjpath