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Description
Staff here were exploring the sample article and noted an accessibility issue. Tabbing will get you into a Sage cell, but then how exactly do you get out? The tab key turns into something that prints a tab character instead of a navigational tool. They call this a "keyboard trap".
Obviously the tab is fundamental to Python and has to keep that behavior. But maybe something can be done to provide a keyboard exit from the cell and also inform a keyboard navigator of that way out.