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HTML

              
                <h1>4点を結んだ折れ線(塗り無し)</h1>
<svg viewBox="0 0 1000 400">
  <polyline points="0,200 250,50 220,350 600,150" stroke="#6890E0" fill="none" stroke-width="4">
</svg>

<h1>4点を結んだ折れ線(塗り有り)</h1>
<svg viewBox="0 0 1000 400">
  <polyline points="0,200 250,50 220,350 600,150" stroke="#6890E0" fill="#9DBEF4" stroke-width="4">
</svg>

<h1>4点を結んだ多角形(塗り無し)</h1>
<svg viewBox="0 0 1000 400">
  <polygon points="0,200 250,50 220,350 600,150" stroke="#F44D61" fill="none" stroke-width="4">
</svg>

<h1>4点を結んだ多角形(塗り有り)</h1>
<svg viewBox="0 0 1000 400">
  <polygon points="0,200 250,50 220,350 600,150" stroke="#F44D61" fill="#FFA4B3" stroke-width="4">
</svg>

<h1>座標の区切りは全部スペースでもOK</h1>
<svg viewBox="0 0 1000 400">
  <polygon points="0 200 250 50 220 350 600 150" stroke="#B1D561" fill="none" stroke-width="4">
</svg>

<h1>座標の区切りは全部,でもOK</h1>
<svg viewBox="0 0 1000 400">
  <polygon points="0,200,250,50,220,350,600,150" stroke="#B1D561" fill="none" stroke-width="4">
</svg>
              
            
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CSS

              
                svg{
  background: #f5f5f5;
}

h1{
  font-size: 16px;
}

              
            
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JS

              
                
              
            
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999px

Console