[PeCaN]

Chinese only has uppercase numbers (called 大写, lit. "big writing").

I̶ ̶d̶o̶n̶'̶t̶ ̶k̶n̶o̶w̶ ̶w̶h̶y̶,̶ ̶b̶u̶t̶ ̶I̶'̶m̶ ̶h̶a̶r̶d̶l̶y̶ ̶a̶n̶ ̶e̶x̶p̶e̶r̶t̶ ̶i̶n̶ ̶C̶h̶i̶n̶e̶s̶e̶.̶ ̶T̶h̶e̶y̶'̶r̶e̶ ̶n̶o̶t̶ ̶u̶s̶e̶d̶ ̶m̶u̶c̶h̶.

EDIT: Nevermind me, see xiaq's much better comment.

[dfc]

Does anyone know why this breaks the content wrapping? I have seen <pre> classes do this but this text is just normal HN comment class.

I really hope using strikeout unicode does not catch on around here. It is horrible.

[PeCaN]

Works fine for me (Firefox on Android and Windows)—I think your browser doesn't handle Unicode combining characters properly. (Chrome gets a little funky with them on Android, haven't used Windows Chrome in a while).

The reason is it's two codepoints but one "grapheme", and some software doesn't handle grapheme clusters well.