I'm using opentype.js on my website behind my "try it out" feature. A site visitor just alerted me that he can't type any special characters. Umlaute, Paragraph marks, etc. don't render. However, I have one font on there that has a lot of variations. Typing an Umlaut there does render a character, though the wrong one. Charset on the page is UTF-8. The format of the font is openType ttf, and it works fine on my machine. I've gone through the opentype.js documentation and haven't found anything illuminating.
Anyone have any ideas?