I have had another look at this bug. There are a log of issues. Looking at 
Museo Sans Rounded with FontForge and some print statements inside Inkscape one 
finds:

Name   PS Weight   TTF Style  Pango  Pango Weight
100       Extra Light 100            300       Light
300       Light            300            300       Light
500       Normal        500            400       Normal
700       Semi Bold   700            600       Semi-Bold
900       Bold             900            700       Bold
1000     Black           1000          900       Heavy

Pango is using the PS Weight to determine the Pango/CSS weight. From
looking at the Pango code, it seems that Extra Light should have a CSS
value of 200. There appears to be a bug parsing the value in Pango.
Inkscape keeps track of fonts using the Pango "Font Description" (PFD)
which is based on CSS font properties. The duplication of weight 300 is
the reason the Inkscape GUI shows only five weights when in fact their
are six. This needs to be fixed in Pango.

Pango does have a function that returns a unique style name "suitable
for displaying to users" for each face in a font family. In the case of
Museo Sans Rounded the values are the same as in the 'Name' column
above. Unfortunately, this information is not easily accessible inside
Inkscape. It will take some hacking to make it available in our GUI (the
argument to the function is a 'face'  which is a temporary object that
exists only when building the font map).

The long term solution has two parts. The first part is we should
support CSS @font-face rules. With this, one can directly link a font
resource (e.g. a font file) to a style. Then there is no guessing about
which font face will be used. No substitution will be necessary. This
will require a lot of work as it is not apparent (at least to me) on how
to get Pango to support "User" fonts. The second part is to support the
CSS Font Module Level 3 'font-variant' property. This allows choosing
which glyphs to use out of a single font face. For example, instead of
needing a separate font file for small-caps, the small-caps are in the
same file as the regular glyphs. This is the current trend with font
packaging and is the direction the HTML/CSS is heading.

As a final comment. Firefox, at least on Linux, uses Pango as a backend.
It has the same bug with Museo Sans Rounded as Inkscape (showing five
weight variants rather than six). But this is better than Chrome and
Opera, which only display two weights.

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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to a duplicate bug report (36876).
https://bugs.launchpad.net/bugs/165521

Title:
  font variants information ignored

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