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<!DOCTYPE html>
<html lang="ja">
<meta charset="UTF-8">
<title>CSS Reference: visibility: collapse hides ruby annotations</title>
<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>