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  <title>Dynamic charoff 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 1rem;font-size:1.25rem;color:#0f172a}table{max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

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  <h1>Dynamic charOff</h1>

  <table border=1>

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      <td id=dynamicCell align=char char=:>Value: 100:200</td>

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  <p class=hint>JavaScript sets <code>cell.charOff = "5%"</code> (note the capital O in the DOM property).</p>

  <script>document.getElementById("dynamicCell").charOff="5%"</script>

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HTML charoff Attribute — Dynamic JavaScript