<!DOCTYPE html> <html lang="ja"> <head> <meta charset="UTF-8"> <title>Bug 1140264</title> <link rel="stylesheet" href="common.css"> </head> <body> <div style="width: 5em; border: 1px solid silver;"> の「<ruby style="font-family: Ahem;">X<rt style="font-size: 0;"><div style="width: 21rem"></div></ruby>」 </div> </body> </html>