Otherwise,

rcParams["svg.fonttype"] = "svgfont"; title("foo"); savefig("/tmp/test.svg")

fails (on Py3) with

  File ".../backend_svg.py", line 86, in escape_attrib    s = s.replace("&", "&")TypeError: a bytes-like object is required, not 'str'

The encoding of entry 1, 0, 0, 4 in the sfnt table is macroman
(https://www.freetype.org/freetype2/docs/reference/ft2-truetype_tables.html#TT_MAC_ID_XXX).

Note that after the fix is applied, the resulting svg file still appears
to be unopenable by inkscape, so the fix is not complete, but hopefully
a step in the correct direction.

Of course, this suggests that the svg.fonttype = svgfont codepath is untested, which is another problem :p

In practice it appears that the svg font standard isn't that popular or well supported, seehttps://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/SVG_fonts.

PR Summary

PR Checklist

• Has Pytest style unit tests
• Code is PEP 8 compliant
• New features are documented, with examples if plot related
• Documentation is sphinx and numpydoc compliant
• Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
• Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way