932061 - Kerning issue of overlapping letters with Advent Pro font

Status: RESOLVED INVALID

(Core :: Graphics: Text, defect)

Description

[Ori Avtalion (salty-horse)]

Attachment: Page showing kerning problem with 'QU'

The attached page has the text "QUIT" rendered with Advent Pro (hosted on Google Fonts).

The letters 'Q' and 'U' overlap.

The text renders fine on Google Chrome 30.0.1599.114

Comment 1

[cmtalbert]

Confirmed with the 10/28/2013 nightly built from  http://hg.mozilla.org/mozilla-central/rev/4646259ab62d using the sample provided.

Comment 2

[Jonathan Kew [:jfkthame]]

This is not a Firefox bug; the font really does have a kern pair for "QU" that makes the glyphs overlap. Inspecting the font file reveals that it has similar kerns for "Q," (the comma almost disappears, as it overstrikes the "tail" of the Q) and for "Q." (the period completely disappears, overstriking the bottom of the Q!)

Chrome doesn't apply kerning by default, but if you add the property
  text-rendering: optimizeLegibility;
it will do so, and you'll see the same issues there.

If you wish, you can disable kerning in Firefox using the property
  -moz-font-feature-settings: "kern" off;
but this will of course result in inferior rendering with well-kerned fonts.

So I would recommend reporting this as a bug in the Advent font. (FWIW, this isn't the only example of excessively-tight kerning in the font; try "P.M." and see how it looks.)