CSS 的font-size-adjust属性告诉浏览器将文本的字体大小调整为相同的大小，而不考虑字体系列。当第一个选择的字体不可用时， font-size-adjust 属性允许您更好地控制字体大小。如果字体不可用，则窗口默认为定义的第二种字体。这可能会导致字体大小发生重大变化。使用 font-size-adjust 属性来阻止这种情况。小写字母“x”和大写字母“X”之间的大小差异就是所有字体的“纵横比值”。当浏览器知道第一种字体的“纵横比值”时，它将确定在查看第二种字体的文本时使用的字体大小。
句法：
font-size-adjust: number|none|initial|inherit;下面的示例说明了font-size-adjust属性的使用。
例子：
HTML
GeeksforGeeks
Font Size Adjust Property
Divs with same Font Size Adjust Property:
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Divs without same Font Size Adjust Property:
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输出 ：
使用 CSS 自动调整字体大小
浏览器支持：
仅有的 Firefox目前默认支持 CSS font-size-adjust 属性。