Misskeyで投稿を引用すると、自動的に「RE: URL」がコンテンツに追加されますが、他のActivityPub実装（AkkomaやFedibird）とは異なり、この部分にCSSクラスがないため、カスタムCSSで非表示にできません。
この問題を解決するために、Misskeyの引用テキストに.quote-inlineクラスを追加する提案をしました。もし賛同していただけるなら、以下のイシューにスターやコメントをお願いします。
When quoting posts in Misskey, “RE: URL” is automatically added to content, but unlike other ActivityPub implementations (Akkoma, Fedibird), this section lacks a CSS class, making it impossible to hide with custom CSS.
I've created an issue proposing to add a .quote-inline class to quoted text in Misskey. If you agree with this improvement, please consider starring or commenting on the issue:
Auf diesem Profil/on this profile:
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An intersectionalist, feminist, and socialist guy living in Seoul (UTC+09:00). 
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