Match markedjs behavior for parsing HTML linebreaks

Author: martinRenou

nbconvert/filters/markdown_mistune.py

@@ -106,6 +106,11 @@ def output_latex_environment(self, m):
 
 class MarkdownWithMath(mistune.Markdown):
     def __init__(self, renderer, **kwargs):
+        # This makes mistune behave more like markedjs
+        # (markedjs behing used by Jupyter Notebook and JupyterLab)
+        kwargs["parse_block_html"] = True
+        kwargs["hard_wrap"] = True
+
         if "inline" not in kwargs:
             kwargs["inline"] = MathInlineLexer
         if "block" not in kwargs: