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SVG font data is missing Delta symbol #347
referenced this issue
Nov 1, 2012
It turns out that the program that creates the SVG data files ends up thinking that Delta is the "increment" glyph (U+2206), and so puts the data for Delta in the wrong place (and loses the path data along the way). This will be fixd in the next release, but for now, you can use
before the script that loads MathJax.js to add the Delta path data to the font when it is loaded. Be sure you don't get any extra linebreaks in the string at the end of the array.