Supports isolated iframe (#1593)

nbconvert/exporters/templateexporter.py

@@ -65,6 +65,7 @@
         'convert_pandoc': filters.convert_pandoc,
         'json_dumps': json.dumps,
         'strip_trailing_newline': filters.strip_trailing_newline,
+        'text_base64': filters.text_base64,
 }
 
 

nbconvert/filters/strings.py

@@ -12,6 +12,7 @@
 import re
 import textwrap
 import warnings
+import base64
 
 from urllib.parse import quote
 
@@ -35,6 +36,7 @@
     'ascii_only',
     'prevent_list_blocks',
     'strip_trailing_newline',
+    'text_base64',
 ]
 
 
@@ -249,3 +251,9 @@ def strip_trailing_newline(text):
     if text.endswith('\n'):
         text = text[:-1]
     return text
+
+def text_base64(text):
+    """
+    Encode base64 text
+    """
+    return base64.b64encode(text.encode()).decode()

share/jupyter/nbconvert/templates/classic/base.html.j2

@@ -127,7 +127,17 @@ unknown type  {{ cell.type }}
 
 {% block data_html scoped -%}
 <div class="output_html rendered_html output_subarea {{ extra_class }}">
+{%- if output.get('metadata', {}).get('text/html', {}).get('isolated') -%}
+<iframe 
+    class="isolated-iframe" 
+    style="height:520px; width:100%; margin:0; padding: 0" 
+    frameborder="0" 
+    scrolling="auto" 
+    src="data:text/html;base64,{{output.data['text/html'] | text_base64}}">
+</iframe>
+{%- else -%}
 {{ output.data['text/html'] }}
+{%- endif -%}
 </div>
 {%- endblock data_html %}