In displayed math I was trying to highlight a piece of a formula using a gray background. After a few spacing failures with \framed, I discovered \mframed in the core-rul.tex source file. The comments there say: %D As usual, one can specify in what way the text should be %D framed. One should be aware of the fact that, inorder to %D preserve the proper spacing, the \type {offset} is set to %D \type {overlay} and \type {frameoffset} is used used %D instead. But I couldn't get the following example of setting frameoffset to enlarge the box; instead the gray box barely surrounds the x^2/2. Is the cause the \@@oioffset in line 1502 of core-rul.tex: [\c!frameoffset=\@@oioffset,\c!offset=\v!overlay,#2] (I'm using ConTeXt - 2008.10.31 13:58, Mk II) \setupcolors[state=start] \def\graymath{\mframed[frame=off, background=color, backgroundcolor=gray, frameoffset=5pt]} \starttext \startformula \ln(1+x) = \graymath{x- \displaystyle{x^2\over2}} + \cdots \stopformula \stoptext