Mozilla.org: Implementation of MathML in Mozilla: Progress ReportApr 23, 2000, 03:17 (0 Talkback[s])
(Other stories by Roger B. Sidje)
"Efforts of the MathML project have culminated to the point where all presentational tags are recognized, except the alignment tags and --both of which happen to be unsupported by most of the existing MathML renderers. Some presentational tags need another pass to further beautify their layout, by filling such things as the italic correction and/or the amount of spacing between some tags. This finishing stylistic touch is motivated by the professionalism that authors have come to expect from sophisticated mathematical typesetting system such as TeX/LaTeX."
"Also, further work remain to render in a fully standards compliant manner, or at least at a level where its usage is pleasant when laying out common mathematical 2D constructs such as matrices, arrays, commutative diagrams. Progress in this direction will rely upon some other work in the CSS2model that Gecko implements."