HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>title — JavaScript example</title>

  <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}p{padding:.5rem .75rem;background:#f1f5f9;border-radius:6px;display:inline-block;cursor:help}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic title</h1>



  <p id=dynamicParagraph>

    This paragraph will have a dynamically set title attribute.

  </p>



  <script>document.getElementById("dynamicParagraph").title="Updated tooltip message."</script>



  <p class=hint>Hover the paragraph — the tooltip text was set by <code>element.title = "..."</code>.</p>

</body>

</html>

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HTML title Attribute — dynamic JavaScript