[css-text-decor] text-underline-position auto in vertical text

[mozilla-apprentice]

A resolution was made for csswg-drafts/#1198.

[css-text-decor] text-underline-position auto in vertical text

• RESOLVED: add auto value for text-emphasis-position, and change the meaning of text-underline-position: auto to care about left vs right in vertical text

Discussion.

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[mozilla-apprentice]

https://bugzilla.mozilla.org/show_bug.cgi?id=1919658