​x
 
<!DOCTYPE html>
<html>
<body>
​
<p id="demo">这是段落。</p>
​
<button type="button" onclick="myFunction()">调整字体大小</button>
 
<p><b>注释：</b>仅 Firefox 支持 fontSizeAdjust 属性。</p>
​
<script>
function myFunction() {
  document.getElementById("demo").style.fontSizeAdjust = "0.58";
}
</script>
​
</body>
</html>
​