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testrem.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta content="telephone=no" name="format-detection"/>
<meta name="apple-mobile-web-app-capable" content="yes"/>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache, must-revalidate">
<meta http-equiv="expires" content="0">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>js control root element</title>
<style type="text/css">
*{
border:0;
margin:0;
padding: 0;
outline:0;
}
html{
font-size: 10px;
}
body div:first-child{
font-size: 3rem;
padding-bottom: 1rem;
}
.container{
margin: 0 auto;
width: 25rem;
height: 5rem;
background-color: #42b983;
}
.container>span{
color:#fff;
font-size: 2rem;
}
</style>
<script type="text/javascript">
(function(){
var width = window.screen.width;
var rate = width/375;
var newFontSize = 'font-size:' + rate*10 + 'px';
document.getElementsByTagName('html').style = newFontSize;
}());
window.onload = function(){
document.getElementById('text').innerHTML = document.getElementsByTagName('html').style;
}
</script>
</head>
<body>
<div>选择不同设备模式后手动刷新浏览器，显示的字体大小为根元素大小</div>
<div class="container">
<span id="text"></span>
</div>
</body>
</html>