HN strips the variation selectors—there aren't any in your comment (also, they go after, like combining characters). What do you see here? https://qaz.wtf/u/sh

HN strips the variation selectors—there aren't any in your comment (also, they go after, like combining characters). What do you see here? https://qaz.wtf/u/show.cgi?show=15%3A%E2%86%94%EF%B8%8E+16%3A%E2%86%94%EF%B8%8F+none%3A%E2%86%94 https://qaz.wtf/u/show.cgi?show=15%3A%E2%86%94%EF%B8%8E+16%3... Edit: I think you're stuck with the emoji arrow for that font: neither U+2194 ↔ LEFT RIGHT ARROW nor U+2B0C ⬌ LEFT RIGHT BLACK ARROW have any defined variation sequences. ⇔ and ⟺ are probably text-style, but you can't change existing content. Hmm… U+2192 → RIGHTWARDS ARROW doesn't vary either, but U+27A1 BLACK RIGHTWARDS ARROW does: https://qaz.wtf/u/show.cgi?show=15%3A%E2%86%92%EF%B8%8E+16%3A%E2%86%92%EF%B8%8F+none%3A%E2%86%92+|+15%3A%E2%9E%A1%EF%B8%8E+16%3A%E2%9E%A1%EF%B8%8F+none%3A+%E2%9E%A1 https://qaz.wtf/u/show.cgi?show=15%3A%E2%86%92%EF%B8%8E+16%3... …and as the only one of the four in the Dingbats block, is stripped by HN.