<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1, minimum-scale=1">
<script type="text/javascript">
if(document.documentElement.clientWidth < 750){
document.documentElement.style.fontSize = document.documentElement.clientWidth / 640*32 + 'px';
console.log(document.documentElement.clientWidth)
}else{
document.documentElement.style.fontSize = "16px";
}
</script>
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<body>
<div>
<span style="font-size:1rem;">danny.xie</span>
<span style="font-size:16px;">danny.xie</span>
</div>
</body>
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