Merge pull request #3250 from liftoff/master

Added a simple __html__() method to the HTML class

IPython/core/display.py

@@ -337,6 +337,14 b' class HTML(DisplayObject):'
     def _repr_html_(self):
         return self.data
 
+    def __html__(self):
+        """
+        This method exists to inform other HTML-using modules (e.g. Markupsafe,
+        htmltag, etc) that this object is HTML and does not need things like
+        special characters (<>&) escaped.
+        """
+        return self._repr_html_()
+
 
 class Math(DisplayObject):