Sandbox for italic int which shall be implemented in {{ intmath/int}} subtemplate so that it can be called from {{ intmath}} to implement the idotsint option, e.g.

{{math| H {{=}} {{intmath/sandbox|idotsint|''n''-ball}} ''dH'' }} yields the HTML text style H = ∫
_n-ball dH

{{bigmath| H {{=}} {{intmath/sandbox|idotsint|''n''-ball}} ''dH'' }} yields the HTML display style

H = ∫
_n-ball dH