In this blog post, I'm going to give an idea of undergoing work in the Mozilla MathML Project. I've also selected a list of MathML bugs that would be interesting to fix in the future. Although I'm not going to give detailed explanations, I hope it will help to see the big picture and maybe bring new contributors to the project.

First, as indicated in the planning for MathML, the two priorities are:

  • Stretching of Operators and Mathematical Fonts

    New rendering, with fonts installedIn mathematical formulas, we need to stretch symbols (such that braces "{" or square roots "√") or to draw large operators (such that sums "∑" or integrals "∫"). The typical way to do that is to use mathematical fonts, which provide glyphs of different sizes or that can be combined together to get a large symbol. Recent work has given a complete support for STIX fonts 1.0. Another method visible in a previous blog post is to apply a scale transform to the symbol. This provides a fallback when STIX fonts are not installed or not sufficient (for example for some accents, triple arrows or large operators). This may even slightly improved the accuracy of the standard stretching. With these two improvements, all the bugs reported by users for stretchy symbols will be fixed in Firefox 4.0.

    In the future, it would be interesting to be able to stretch operators in the diagonal direction as well as inside mtable cells, the combination being particularly useful to draw diagonal arrows. The idea to get a "beautiful" diagonal stretching is to use the current stretching for horizontal/vertical operators, followed by a rotation. There are also two annoying bugs causing stretch failures that are worth fixing.

    For the mathematical fonts, support for Asana-Math font is underway. Support for Cambria Math font would also be nice, because it is installed in recent versions of Windows, Microsoft Office and other Microsoft's products. For both fonts, it is helpful to extract information from the Open MATH Table and it will even improve the rendering of formula beyond stretching. There are also various proposals to inform user of lacking fonts and launch an automated installation.

    Finally, related improvements for operator dictionary, embellished operators, operator forms and large operators are coming in a near future.

  • MathML Project Documentation

    Mozilla writing on blackboardFor quite a long time, the Mozilla MathML Project Page had been lacking maintenance and most pages were outdated. Last April, we started to migrate and update the former project page to The page Authoring MathML now briefly gives the principal hints to use MathML in XHTML (until we have HTML5) and then presents miscellaneous authoring tools. A more up-to-date Status Page is available and includes new features of MathML 3. Some pages to register our results of MathML3 Testsuite have been prepared but are mostly empty for the moment. Finally, for people willing to contribute to the project, new pages for MathML development are available on In particular, one can find there more precise information on the planning for MathML.

    Updating MathML documentation is something for which we could get more help and the migration to wiki pages is likely to make contributions easier. However, this migration is not complete yet. Apart from remaining screenshots and old documentation on fonts, the main problem is that does not allow the use of MathML. Hence, we need to wait MathML-in-HTML5 support on to migrate demo pages. Additionally, we need to fix several errors in the demo pages. Finally, let's mention a seven-years-old bug for which help would be appreciated: translating the MathML start page to Arabic and Chinese.

There are of course many other topics to work on: