Note You need to log in before you can comment on or make changes to this bug. Description From 2012-05-06 07:39:10 PST "An mpadded element renders the same as its child content, but with the size of the child's bounding box and the relative positioning point of its content modified according to mpadded's attributes." MathJax uses mpadded to implement many LaTeX commands. Some reftests: http://devel.mathjax.org/testing/testsuite/MathMLToDisplay/Presentation/GeneralLayout/mpadded/