HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS inset-block Zero Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .container {

      position: relative;

      width: 220px;

      height: 160px;

      border: 2px dashed #94a3b8;

      border-radius: 0.35rem;

      background: #f8fafc;

    }



    .sidebar {

      position: absolute;

      inset-block: 0;

      inset-inline-start: 0;

      inline-size: 4rem;

      background: #7c3aed;

      border-radius: 0.35rem 0 0 0.35rem;

    }

  </style>

</head>

<body>

  <h1>inset-block: 0</h1>

  <div class="container">

    <div class="sidebar"></div>

  </div>

</body>

</html>

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CSS inset-block Property - stretch with zero