Loosely related to this, a simple cell magic for writing to an HTML 2D 
canvas element: https://github.com/psychemedia/ipython_magic_canvas

--tony

On Friday, 20 January 2017 13:38:46 UTC, Steven Silvester wrote:
>
> Right, I meant that a subset of HTML could be used in the html_repr as a 
> fallback display in an untrusted notebook.
>
>
> On Sunday, January 15, 2017 at 10:28:32 AM UTC-6, Björn Johansson wrote:
>>
>> Hi, I would like to add a javascript representation to the class below. I 
>> would like to have a circle drawn on a HTML5 canvas. Is this even possible? 
>> The code below does not work and I do not know very much javascript. I 
>> would be grateful for help. The code below executes, but nothing is drawn 
>> in the cell. I have looked at the ipywidgets 
>> <https://github.com/ipython/ipywidgets>, but it is not clear to me how 
>> to modify the code below.
>>
>> *class MyCircle(object):*
>>
>> *    def __init__(self, center=(0.0,0.0), radius=1.0, color='blue'):*
>> *        self.center = center*
>> *        self.radius = radius*
>> *        self.color = color*
>>
>> *    def _repr_html_(self):*
>> *        return "&#x25CB; (<b>html</b>)"*
>>
>> *    def _repr_svg_(self):*
>> *        return """<svg width="100px" height="100px">*
>> *           <circle cx="50" cy="50" r="20" stroke="black" 
>> stroke-width="1" fill="blue"/>*
>> *        </svg>"""*
>>     
>> *    def _repr_latex_(self):*
>> *        return r"$\bigcirc \LaTeX$"*
>>
>> *    def _repr_javascript_(self):            *
>> *        s=(    'var canvas = document.createElement("canvas");'    *
>> *               'canvas.height= 400;'*
>> *               'canvas.width = 400;'*
>> *               'var context = canvas.getContext("2d");'*
>> *               'document.body.appendChild(canvas);')*
>> *        return s*
>>
>

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