Comment 11 for bug 1386778

I tried dragging fonts on to http://www.impallari.com/testing/index.php and clicked on "OpenType Features". I saw a listing of features but it was the same regardless of what font I tried. Clicking on various buttons changed the displayed sample text but there was no way to a priori know what features are available.

We rely on PanGo and HarfBuzz for font support. They are great for displaying text but have almost no functionality for reporting what features a particular font supports. Inkscape already does show some information on the "Variants" tab of the "Text and Font" dialog. Ligature, position, capitals, and numeric options are grayed out when the font does not support the corresponding tables. We might be able to extract out which 'ssxx' fields are available.