July 21, 2011 at 8:29 PM by Dr. Drang
Lost in all the Lion hubbub is Safari 5.1’s new MathML renderer. As someone who occasionally puts equations on his web site1, I’ve been looking forward to this. A few weeks ago I downloaded a build of WebKit, the experimental browser that’s sort of a Safari test bed, to get a sense of how polished Safari’s MathML support was going to be. I wasn’t especially impressed but hoped Safari itself would do a better job when it was released. It doesn’t.
The easiest way to compare Safari’s MathML rendering with other ways of viewing math is to go to this page set up by Peter Luschny. He’s created three pages with the same content: one that uses images to display equations (which we won’t concern ourselves with), one that uses MathJax (which is what I use for equations in my posts), and one that uses MathML.
Here’s a screenshot of the section on Eulerian polynomials as rendered by MathJax:
Pretty darned good. Here’s a screenshot of that same section as rendered by MathML:
The screenshots are slightly reduced to get them to fit comfortably in the blog. Click on the images if you want to see them full sized on Flickr.
The two main problems with the MathML rendering are shown in this screenshot:
- An inability to maintain a baseline. You see this in the first two equations where the closing parentheses (and the symbols after them) are set too low.
- Overlapping components. You see this in the third equation where the superscripts of the 2 and the 4 run over the symbols that come after them.
I’m sure Safari will improve, but this is pretty poor performance, especially when you consider that Firefox has had a good MathML renderer for at least six years. Here’s that same section in FF 3.6.13:
I think the negative signs in the second and third equations are a bit too far from what they’re negating, and I’d prefer larger summation symbols, but otherwise this is very good rendering.
That link goes to what may be my favorite post ever. Crisp diagrams, several equations, Gnuplot graphs, a practical application, and a Wizard of Oz reference. It’s what I wanted every lecture to be like back when I was teaching. ↩