> Addtionaly, I’m not certain whether U+002F can also used for producing this effect, so I don’t use U+002F for 'frac' feature in this testcase.

Recently I have noticed several fonts can transform U+002F as division slash like glyph when 'frac' feature is enabled, so I think U+002F should also have this form for 'frac' feature.

I found two test cases:

http://fred-wang.github.io/MathFonts/GNUFreeSerif/index.html
http://fred-wang.github.io/MathFonts/GNUFreeSans/index.html

I think I know what was happend. Some problems as brackets composing disorderly is caused by Firefox itself, because in Firefox some glyphs can floating one pixel after zoom in or zoom out.

Hi Hsing-yen He,

Please be sure you are looking at FreeSerif.
Print to File from Firefox, then in Acrobat, File->Properties->Fonts.  If you see something besides FreeSerif, chances are, confusion is happening in the page.

There are several things to do in Firefox:
1, in about:config, search for 'math'.  There is a list of fonts.  Replace it with just FreeSerif.
2, copy the html file onto your local disk, get rid of any CSS that loads fonts (or stylesheets).  Maybe put explicit CSS in to use FreeSerif:
body,math{font-family:freeserif}

Note the MATH tables in the font have been under heavy develop lately.

Hi Hsing-yen,

Are you saying you are now satisfied with the font's performance on this issue?

About the extensible marks: I'm not sure what's going on here, for the overbrace and over-parenthesis, it seems to use the characters in the font.  For others (arrows) and for stretchable marks (hat, tilde), it is not using glyphs from the font.

I have asked those involved more than once what is going on here, but at this time have received no useful information.

Hi Hsing-yen,

Please explain what you are seeing, and what you find wrong about it.

I made a small test with underbrace, but it works as I would expect.  However the PDF file contains some letters from a different font, "LModernMath".  I don't understand that -- I think all the characters and symbols shown are from FreeSerif.


I know that MATHML in Firefox using FreeFont, some symbols don't appear right-- sometimes anyway it is choosing the symbols from other fonts--I don't know why.  I do not know whether something is wrong with the font, or what.  But this technology is still fairly new.

Cheers!

(file #33626, file #33627)

I don't know if those guys have a recent build of FreeFont,
but I think you do.
Do you personally see any problems in particular?

You mention vulgar fractions.  In the USAGE file these are called diagonal fractions.  These are not enabled by default, but with the 'frac' font feature, or by the CSS setting
    font-variant-numeric: diagonal-fractions;
Furthermore, "stacked" fractions can be turned on by
    font-variant-numeric: stacked-fractions;

See attachment.


(file #33570)