<!DOCTYPE html> <!-- Reftest 1 for Bug 1395777 (reference file) --> <html lang="zh-TW"> <head> <meta charset="UTF-8"> <style> body { font-size: 30px; line-height: 1; } .rbc { height: 30px; display: inline-block; vertical-align: top; } .rtc { height: 30px; display: inline-block; writing-mode: vertical-rl; text-orientation: upright; vertical-align: top; text-align: center; font-size: 30%; } </style> </head> <body> <div> <span class="rbc">BASE</span><span class="rtc">RT</span> </div> </body> </html>