Typekit Error "Adjusting Mac Style"

Question

I get the following errors in my firefox-console when i use italic styles of a typekit font (din-2014).

downloadable font: OS/2: adjusting Mac style (regular) (font-family: "tk-din-2014-i2" style:italic weight:200 stretch:normal src index:0) source: https://use.typekit.net/af/a8689e/00000000000000003b9aee0b/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i2&token=1MThhP5l1O0ejpAro7ZFnw%3D%3D

Should i do something to solve this problem or can i just go on with it?

Answer 1

This warning is generated by the OpenType Sanitizer (OTS) library which is included in Firefox.¹

"The OpenType Sanitizer (OTS) parses and serializes OpenType files (OTF, TTF) and WOFF and WOFF2 font files, validating them and sanitizing them as it goes."²

To fix the warning you would need to change the font file.

You can verify that the font is still being applied using the Firefox inspector:

---

1. https://github.com/khaledhosny/ots/blob/2ecd07625c18dbc0f6b808d7565ed4448f064b52/src/os2.cc#L151
2. https://github.com/khaledhosny/ots