<!DOCTYPE html> <html lang="ja"> <meta charset="UTF-8"> <title>CSS Reference: visibility: collapse hides ruby annotations</title> <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org"> <style> body { line-height: 5; } rt { font-size: 80%; } </style> <ruby> <rb>昆</rb><rb>虫</rb><rb>記</rb> <rt>こん</rt><rt>ちゅう</rt><rt>き</rt> </ruby><br> <ruby> <rb>昆</rb><rb>虫</rb><rb>記</rb> <rt>こん</rt><rt style="opacity: 0">ちゅう</rt><rt>き</rt> </ruby><br> <ruby> <rb>昆</rb><rb>虫</rb><rb>記</rb> <rt>こん</rt><rt></rt><rt>き</rt> </ruby>