<head>
  <style> body { color: red; margin: 5px } </style>
</head>
<body>
  <script>
    let computedStyle = getComputedStyle(document.body);
    // يمكننا الآن قراءة اللون والهامش 
    alert( computedStyle.marginTop ); // 5px
    alert( computedStyle.color ); // rgb(255, 0, 0)
  </script>
</body>
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