HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>overscroll-behavior-x: contain</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .page {
      width: 100%;
      max-width: 36rem;
      overflow-x: auto;
      padding-bottom: 8px;
    }

    .page-inner {
      display: flex;
      gap: 12px;
      width: max-content;
      min-width: 140%;
    }

    .strip {
      width: 200px;
      overflow-x: auto;
      overscroll-behavior-x: contain;
      box-sizing: border-box;
      padding: 10px;
      border: 2px dashed #334155;
      background: #f8fafc;
      white-space: nowrap;
    }

    .strip span {
      display: inline-block;
      margin-right: 8px;
      padding: 8px 10px;
      border: 1px solid #cbd5e1;
      background: #fff;
    }
  </style>
</head>
<body>
  <p>Scroll the dashed strip left or right to an edge, then keep scrolling. <strong>overscroll-behavior-x: contain</strong> keeps that extra scroll inside the strip.</p>
  <div class="page">
    <div class="page-inner">
      <div class="strip">
        <span>One</span>
        <span>Two</span>
        <span>Three</span>
        <span>Four</span>
        <span>Five</span>
      </div>
      <span>Outer A</span>
      <span>Outer B</span>
      <span>Outer C</span>
    </div>
  </div>
</body>
</html>

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CSS overscroll-behavior-x Property — contain