From SageMath 6.10, the html notebook cell cann't work.
The following message is shown:
"Traceback (click to the left of this block for traceback) ... TypeError: eval() got multiple values for keyword argument 'locals' "
Perhaps the reason for this is that function html() has been updated.
How will I solve this problem.
By the way, is the markdown cell available in future versions of Sage?