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回答

以前css无法做到实时显示网页屏幕的长度和宽度,但是css3通过@property 实现了,下面是完整的示例代码:

点击查看完整代码

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
    <title>BFW NEW PAGE</title>
    
     <style>
 @property --vh {
  syntax: '<length>';
  inherits: true;
  initial-value: 100vh;
}
 @property --vw {
  syntax: '<length>';
  inherits: true;
 initial-value: 100vw;
}
:root {
    --w: tan(atan2(var(--vw),1px));
    --h: tan(atan2(var(--vh),1px));

}

body::before {
  content: counter(w) "x" counter(h);
  counter-reset: w var(--w) h var(--h);
  font-size: 150px;
  font-weight: 900;
  position: fixed;
  inset: 0;
  width: fit-content;
  height: fit-content;
  color: black;
  background-color: white;
  padding: 10px;
  margin: auto;
}

      </style>
</head>
<body>
  
</body>
</html>
		

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