Feditext, Feditext beta users: today's 1.7.2 build 84 fixes Siren's inability to render underline and strikethru text: https://github.com/feditext/feditext/issues/311
if you are not using Siren, this will not affect you; however, we recommend switching to Siren as the HTML parser in app preferences instead of WebKit, as it's much faster, especially on iOS 17. Siren will completely replace WebKit soon.