HTML Code
<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

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

  <title>media — dynamic JS</title>

  <link id="dynamicSheet" rel="stylesheet" media="(max-width: 599px)" href="data:text/css,.card{padding:1rem;border-radius:8px;background:%23fde68a;color:%2392400e;font-family:system-ui,sans-serif}">

  <style>

    body {

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

      margin: 0;

      padding: 1.5rem;

      background: #f8fafc;

      color: #334155;

      line-height: 1.7;

    }

    h1 { margin: 0 0 0.75rem; font-size: 1.25rem; color: #0f172a; }

    button {

      margin-top: 0.75rem;

      padding: 0.5rem 1rem;

      font: inherit;

      cursor: pointer;

      border-radius: 6px;

      border: 1px solid #cbd5e1;

      background: #fff;

    }

    .status {

      margin-top: 0.75rem;

      font-size: 0.8125rem;

      color: #64748b;

      max-width: 420px;

    }

    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }

  </style>

</head>

<body>

  <h1>link.media in JavaScript</h1>

  <div class="card">This card is styled by a linked sheet whose <code>media</code> condition you can change.</div>

  <button type="button" id="applyAll">Set media to "all"</button>

  <button type="button" id="applyWide">Set media to "(min-width: 600px)"</button>

  <p class="status" id="status">Current media: (max-width: 599px)</p>



  <script>

    var sheet = document.getElementById("dynamicSheet");

    var status = document.getElementById("status");

    document.getElementById("applyAll").addEventListener("click", function () {

      sheet.media = "all";

      status.textContent = 'media updated to "all" — stylesheet always applies.';

    });

    document.getElementById("applyWide").addEventListener("click", function () {

      sheet.media = "(min-width: 600px)";

      status.textContent = 'media updated to "(min-width: 600px)" — styles only on wide viewports.';

    });

  </script>

</body>

</html>
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HTML media Attribute — Dynamic media with JavaScript
