My apologies, I've sent this off in the wrong direction. On my Mac, when the OS2.sxHeight is set to 0 it appears to be falling back to some other metric in the font, which happens to be 0.8em. I haven't yet figured out which metric it is. -- GitHub Notification of comment by faceless2 Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5243#issuecomment-652701128 using your GitHub accountReceived on Wednesday, 1 July 2020 23:54:06 UTC
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