Good - Calibri is not open, badly supported on Linux et al.
HN should rejoice in the US gov using a font that is open and truly cross platform.
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HN should rejoice in the US gov using a font that is open and truly cross platform.
I don't think it's included by default but the font itself will just work once you install it.
As for open fonts (can fonts even be truly closed in the first place?), Times New Roman is just as closed and proprietary as Calibri is.