[web app] Are there metrics labels available?

[arrowtype]

Looking at a font in Samsa, I see that one of the font metrics(?) plunges way down around wght=200, and I’m not sure why, or what that value might be:

Screen.Recording.2023-05-29.at.6.19.08.PM.mov

Is there a way to see a label for that within the app?

[arrowtype]

Oh, I think I found it!

Looks like it might be stro (strikeout offset) within the mvar table.

I’ll dig a little further to see if I’ve set that with a silly mistake, somewhere.

[arrowtype]

The OT Spec relates stro to OS/2.yStrikeoutPosition:

'stro'	strikeout offset	OS/2.yStrikeoutPosition

So, after looking into the font slightly further, I’m wondering if Samsa is being inaccurate here.

If I use the FontTools Instancer to instance the variable font at wght=200 vs wght=750 (opsz=72 in both), then inspect with TTX, the OS/2.yStrikeoutPosition is different but pretty similar:

• <yStrikeoutPosition value="633"/> for wght=200
• <yStrikeoutPosition value="615"/> for wght=750

Here’s a variable font that exhibits the issue (it has a limited/trial glyphset, so I can share it here, and folks are welcome to use it for testing purposes / inspecting internal font data:):
AT-NameSansVariable.Trial.ttf.zip

[Lorp]

Thanks for the report. I didn’t complete MVAR handling to my satisfaction, so I don’t think it’s reliable for now. I’ll take a look soon.