HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block-start-style Solid</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    p {
      border-block-start-style: solid;
      border-block-start-width: 3px;
      border-block-start-color: #3498db;
      padding-block-start: 0.75rem;
      max-width: 28rem;
    }
  </style>
</head>
<body>
  <h1>Paragraph with Custom Block-Start Border Style</h1>
  <p>This paragraph has a solid border on the block-start side.</p>
</body>
</html>

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CSS border-block-start-style Property - Solid Border