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I've tried posting this question to the Fontographer and FontLab mail lists with no answers. I'm hoping someone here can help!
In testing my font in HTML, the overline does not appear as expected. In the image at http://parthia.com/fonts/images/overline_error.gif you can see the problem: each character of the properly behaved overlined Arial font is followed by the "collapsed" overlined font character of my sans serif font, Numismatica. The same is illustrated for TNR.
What design defect causes the collapsed overline, and where should I begin in order to correct the problem? I want my font to mesh seamlessly with Times New Roman, including overlines and underlines in the same line of HTML text.
I've been searching the specs and studying the tables, but haven't figured this out. Please help if you can!