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Math typesetting

Why are we leaving such an important issue to under-resourced volunteers and small organisations?

Typesetting math in HTML was for a long time one of those ‘I can’t believe that hasn’t been solved by now!’ issues. It seemed a bit wrong – wasn’t the Internet more or less invented by math geeks? Did they give up using the web back in 1996 because it didn’t support math? (That would explain the aesthetic of many ‘home pages’ for math professors.)

MathML is the W3C-recommended standard markup for equations – its like ‘HTML tags for math.’ While MathML has a long history and has been established in XML workflows for quite some time, it was only with HTML5 that mathematics finally entered the web as a first-class citizen. This will hopefully lead to some interesting developments as more users explore MathML and actually use it as creatively as they’ve used ‘plain’ text.

However the support in browsers has been sketchy. Internet Explorer does not support MathML natively, Opera only supports a subset, and Konqueror does not support it. WebKit’s partial support only recently made it into Chrome 24 and was held back on Safari due to a font bug. Firefox wins the math geek trophy hands down with early (since FF 3) and best (though not yet complete) support for MathML.

What’s the hold up?

It seems that equation support is underwhelmingly resourced in the browser development world. WebKit’s great improvements this year (including a complete re-write + the effort to get it through Chrome’s code review) have been due to a single volunteer, Dave BartonFrédéric Wang plays the same heroic (and unpaid) role for Firefox. The question is: Why is this critical feature being left to part-time voluntary developers? Aren’t there enough people and organisations out there that would need math support in the browser (think of all the university math departments just for starters…) to pay for development?

As a result we have no browser that fully supports MathML. While you cannot overstate the accomplishments of the volunteer work, it’s important to tell the full story. Recent cries that Chrome and Safari support MathML can give the wrong impression of the potential for MathML when users encounter bad rendering of basic constructs. The combination of native MathML support, font support and authoring tools (more on this in a later post) makes mathematical content one of the most complex situations for web typesetting.

There have been some valiant attempts to fix this lack of equation support with third-party math typesetting code (Javascript), notably Asciimath by Peter Jipsen with its human-readable syntax and image fallbacks, jqmath by Dave Barton (same as above), and MathQuill.

However by far the most comprehensive solution is the MathJax libraries (Javascript) released as Open Source. While MathJax is developed by a small team (including Frédéric Wang above) they are bigger than most projects, with a growing community and sponsors. MathJax renders beautiful equations as HTML-CSS (using webfonts) or as SVG. The mark up used can be either MathML, Asciimath or TeX. That means authors can write (ugly) mark up like this:

J_\alpha(x) = \sum\limits_{m=0}^\infty \frac{(-1)^m}{m! \, \Gamma(m + \alpha + 1)}{\left({\frac{x}{2}}\right)}^{2 m + \alpha}

into an HTML page and it will be rendered into a lovely looking scalable, copy-and-past-able equation. You can see it in action here.

So why is this really interesting to publishing?

Well…While EPUB3 specifications support MathML this has not made it very far into ereader devices. However MathJax is being utilised in ereader software that has Javascript support. Since many ebook readers are built upon WebKit (notably Android and iOS apps, including iBooks) this strategy can work reasonably effectively. Image rendering of equations in ebook format is another strategy, and possibly the only guaranteed strategy at present, however you can’t copy, edit, annotate or scale the equations and you cannot expect proper accessibility with images.

The only real solution is full equation support in all browsers and ereaders either through native MathML support or through inclusion of libraries like MathJax. We can’t do anything to help the proprietary reader developments get this functionality other than by lobbying them to support EPUB3 (a worthwhile effort) but since more and more reading devices are using the Open Source WebKit we can influence that directly.

The publishing industry should really be asking itself why it is leaving such an important issue to under-resourced volunteers and small organisations like MathJax to solve. Are there no large publishers who need equation support in their electronic books that could step forward and put some money on the table to assist WebKit support of equations? Couldn’t more publishers be as enlightened as Springer and support the development of MathJax? You don’t even have to be a large publisher to help - any coding or financial support would be extremely useful.

It does seem that this is a case of an important technological issue central to the development of the publishing industry ‘being left to others’. I have the impression that it is because the industry as a whole doesn’t actually understand what technologies are at the center of their business. Bold statement as it is, I just don’t see how such important developments could go otherwise untouched by publishers. It could all be helped enormously with relatively small amounts of cash. Hire a coder and dedicate them to assist these developments. Contact Dave Barton or MathJax and ask them how your publishing company can help move this along and back that offer up with cash or coding time. It’s actually that simple.

Many thanks to Peter Krautzberger for fact checking and technical clarifications.

All posts by Adam Hyde are CC-BY-SA

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  • Rotemheliconbooks

    At Helicon Books have tested several EPUB readers and at least for Android we haven’t found any reader that fully support MathML. Right now the only reader that we know which sully supports MathML is 
    Helicon Books Gyan Reader 
    See: http://www.heliconbooks.com/article/news_10

    • http://blog.booki.cc adam hyde

      Any Android reader that is built on webkit will support MathML through the inclusion of MathJax.

      • Paul Topping

        It is much better to include MathJax in the EPUB reader not in each book that needs it. For one thing, most ebook readers do not handle JavaScript in the ebook for security reasons presumably. Even when they do, it is for programming buttons and interaction, not for math typesetting which can affect layout.

        The MathJax Consortium has added MathJax to the IDPF’s Readium EPUB3 reader to serve as a model for other ebook readers to do the same.

        • http://blog.booki.cc adam hyde

          totally agree but if the reader does not support mathml then mathjax comes into play. images are also an option as i mentioned but not good for scalability, accessibility etc

          • http://www.heliconbooks.com/ Rotem Segal

            Helicon Books Reader support MathML through mathjax with no need to include the mathjax library by the book creator

          • http://blog.booki.cc adam hyde

            there you go…even some readers that would not otherwise be able to support equations can do so because of open source libs like MathJax…the publishing industry should take note of that. support these developments!

  • Shilpi

    Hi, there is an ebook reader Dolphin EasyReader that supports MathML. Also to create MathML, check out the products by Design Science.

    • http://blog.booki.cc adam hyde

      Ah yes, but all closed source. I will be writing next week about an Open Source math equation editor that looks very good.

      • AC

         amaya?

        • http://blog.booki.cc adam hyde

          can you provide a link AC?

          • AC

             I was asking about the open source math equation editor…. Are you talking about Amaya? http://www.w3.org/Amaya/

          • http://blog.booki.cc adam hyde

            nope :) 

          • Anonymous Coward

            In that case, I’ll look forward to your post next week … As much as dislike closed source editors (mathflow, wiris, formulator, mathematica, etc), I could not find anything open source in the same league, even after I lowered my expectations tenfolds…

      • Anonymous Coward

         Dismissing Shilpi’s choice for an editor (the best editor money can buy right now) and then proposing a “very good” editor that is just one textarea that you cannot even resize… ha!  What a joke.

    • http://peter.krautzberger.info/ Peter Krautzberger

      Dolphin is great, but it has ways to go — just try this epub3 sample with MathML to see performance grind to a halt.

      For more epub readers and their MathML support, check http://www.mathjax.org/resources/epub-readers/

  • http://www.rsc-ne-scotland.org.uk/mashe/ mhawksey

    a real eye-opener in terms of how much is being done in this area by so few. As a footnote I’d just like to link to the work University of Birmingham who have developed a tool for converting PDF into formats such as LaTeX, MathML and text http://www.cs.bham.ac.uk/research/groupings/reasoning/sdag/maxtract.php … another piece of the jigsaw

  • kimura

    I am the author of ReFormat, a C/C++ library for converting MathML to various formats, including PNG, SVG, XAML. I abandoned development due to lack of interest from potential users.

    The lack of a paid development gig was the last straw.

    Here’s the link with screenshots: http://reformath.webnode.com/ or http://reformath.weebly.com