<!DOCTYPE html>
<html lang="ja">
<meta charset="utf-8">
<style>
body {
  font: 16px/2 sans-serif;
}
.test {
  font: 32px sans-serif;
  text-decoration: 2px red underline;
  text-underline-offset: 1px;
}
</style>
<div>The underline should skip descenders on the English but not the Japanese:</div>
<div class=test>skipping 土砂災害警戒情報 skipping</div>