If one supplies the id of an element that happens to be a table cell to the JSXGraph.initBoard method, the board is created OK, but thereafter it starts to expand on its own, apparently without limit. This does not seem to be desirable behavior.

For an example, see https://jsfiddle.net/sb1xvgck/1/ -- you have to remove the /* comment opener characters at the beginning of the line that starts const balloonboard = and then hit the Run button. (I didn't want to create a fiddle that would just start taking over the example window all on its own.) To see the magically expanding Board, scroll down a bit in the "results" window showing what's produced by the fiddle.

Please let us know if you'd like us to work on a PR for this situation.