Merge pull request #6564 from rossant/iframe-height-quote-missing

Added missing quotation mark in iframe height property

IPython/lib/display.py

@@ -203,7 +203,7 b' class IFrame(object):'
     iframe = """
         <iframe
             width="{width}"
-            height={height}"
+            height="{height}"
             src="{src}{params}"
             frameborder="0"
             allowfullscreen