On 16/01/2017 00:58, Andrew Parsloe wrote: > Only recently have I learnt to distinguish inline from display-style > maths mode by using \mode_if_inner:TF. It would be helpful for those of > us who come to expl3 programming without a good prior grounding in TeX > if a comment to this effect could be added to the documentation > (interface3.pdf). > > Andrew \mode_if_inner:TF is a wrapper around \ifinner so can't be used to distinguish inline from display. In fact in math \ifinner can't be used to detect much useful at all, the points at which tex is or is not in inner math mode are not usually interesting. (Unlike testing for inner when in vertical mode that tells you if you are in a box or on the main vertical list) David ________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Microsoft Office 365. ________________________________