<html xmlns="http://www.w3.org/1999/xhtml">
- <body style="font-size: 48px;">
+ <body style="font-size: 48px; overflow: hidden;">
<div style="-webkit-line-box-contain: block glyphs;">
<div style="-webkit-writing-mode:vertical-lr; border: solid red 1px">為<ruby>櫻</ruby>田</div>
<div style="border: solid green 1px">為<ruby>櫻</ruby>田</div>