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The site also has a page on Underlining [0], in which the author explains his perspective on underlining as an unsightly relic of mechanical typewriters, which had no other ways -- italicizing, bolding, different fonts, small-caps -- of emphasizing text. His is a style guide for professional publishing, in which appearances matter.

[0] https://practicaltypography.com/underlining.html

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To me hyperlinks are about the only valid use of underline. It’s clumsy and ugly when used for emphasis or in titles, but hyperlinks cannot really be distinguished otherwise (a different colour helps as well, but you cannot guarantee that it will be rendered correctly, and it is distracting in a long text).

> His is a style guide for professional publishing, in which appearances matter.

All the more reason not to have jarring capitalisation and weird circles.

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