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  <title>xmlns — 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}#canvas{min-height:80px}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

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  <h1>createElementNS</h1>

  <div id=canvas aria-live=polite></div>



  <script>var SVG_NS="http://www.w3.org/2000/svg",svg=document.createElementNS(SVG_NS,"svg");svg.setAttribute("width","120"),svg.setAttribute("height","60"),svg.setAttribute("viewBox","0 0 120 60");var rect=document.createElementNS(SVG_NS,"rect");rect.setAttribute("x","10"),rect.setAttribute("y","10"),rect.setAttribute("width","100"),rect.setAttribute("height","40"),rect.setAttribute("fill","#22c55e"),rect.setAttribute("rx","6"),svg.appendChild(rect),document.getElementById("canvas").appendChild(svg)</script>



  <p class=hint>When building SVG with JavaScript, use <code>createElementNS</code> with the namespace URI. Do not rely on <code>setAttribute('xmlns', …)</code> on random HTML elements.</p>

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HTML xmlns Attribute — JavaScript createElementNS