Start deprecating %%javascript/%%js

See  #13376

IPython/core/magics/display.py

@@ -1,82 +1,93 b''
 """Simple magics for display formats"""
 #-----------------------------------------------------------------------------
 #  Copyright (c) 2012 The IPython Development Team.
 #
 #  Distributed under the terms of the Modified BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Our own packages
 from IPython.display import display, Javascript, Latex, SVG, HTML, Markdown
 from IPython.core.magic import  (
     Magics, magics_class, cell_magic
 )
 from IPython.core import magic_arguments
 
 #-----------------------------------------------------------------------------
 # Magic implementation classes
 #-----------------------------------------------------------------------------
 
 
 @magics_class
 class DisplayMagics(Magics):
     """Magics for displaying various output types with literals
 
     Defines javascript/latex/svg/html cell magics for writing
     blocks in those languages, to be rendered in the frontend.
     """
 
     @cell_magic
     def js(self, line, cell):
         """Run the cell block of Javascript code
 
         Alias of `%%javascript`
+
+        Starting with IPython 8.0 %%javascript is pending deprecation to be replaced
+        by a more flexible system
+
+        Please See https://github.com/ipython/ipython/issues/13376
         """
         self.javascript(line, cell)
 
     @cell_magic
     def javascript(self, line, cell):
-        """Run the cell block of Javascript code"""
+        """Run the cell block of Javascript code
+
+        Starting with IPython 8.0 %%javascript is pending deprecation to be replaced
+        by a more flexible system
+
+        Please See https://github.com/ipython/ipython/issues/13376
+        """
         display(Javascript(cell))
 
 
     @cell_magic
     def latex(self, line, cell):
         """Render the cell as a block of LaTeX
 
         The subset of LaTeX which is supported depends on the implementation in
         the client.  In the Jupyter Notebook, this magic only renders the subset
         of LaTeX defined by MathJax
         [here](https://docs.mathjax.org/en/v2.5-latest/tex.html)."""
         display(Latex(cell))
 
     @cell_magic
     def svg(self, line, cell):
         """Render the cell as an SVG literal"""
         display(SVG(cell))
 
     @magic_arguments.magic_arguments()
     @magic_arguments.argument(
         '--isolated', action='store_true', default=False,
         help="""Annotate the cell as 'isolated'.
 Isolated cells are rendered inside their own <iframe> tag"""
     )
     @cell_magic
     def html(self, line, cell):
         """Render the cell as a block of HTML"""
         args = magic_arguments.parse_argstring(self.html, line)
         html = HTML(cell)
         if args.isolated:
             display(html, metadata={'text/html':{'isolated':True}})
         else:
             display(html)
 
     @cell_magic
     def markdown(self, line, cell):
         """Render the cell as Markdown text block"""
         display(Markdown(cell))