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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <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 .75rem;font-size:1.25rem;color:#0f172a}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .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"),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>

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HTML media Attribute — Dynamic media with JavaScript