字体大小为：1rem 的文本应该是：
该问题仅在所有这些条件下重现：
- IOS
- 水平方向
- 跨度标记之外的一些文本
HTML 代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.t5 { font-size: 0.5rem;}
.t6 { font-size: 0.6rem;}
.t7 { font-size: 0.7rem;}
.t8 { font-size: 0.8rem;}
.t9 { font-size: 0.9rem;}
.t10 { font-size: 1.0rem;}
.t11 { font-size: 1.1rem;}
.t12 { font-size: 1.2rem;}
.t13 { font-size: 1.3rem;}
.t14 { font-size: 1.4rem;}
.t15 { font-size: 1.5rem;}
</style>
</head>
<body>
Some text<br />
<span class="t5">Test text 0.5</span><br />
<span class="t6">Test text 0.6</span><br />
<span class="t7">Test text 0.7</span><br />
<span class="t8">Test text 0.8</span><br />
<span class="t9">Test text 0.9</span><br />
<span class="t10">Test text 1.0</span><br />
<span class="t11">Test text 1.1</span><br />
<span class="t12">Test text 1.2</span><br />
<span class="t13">Test text 1.3</span><br />
<span class="t14">Test text 1.4</span><br />
<span class="t15">Test text 1.5</span><br />
</body>
</html>