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HTML

              
                <h1>viewBoxの値がビューポートと同じ(width="400" height="200" viewBox="0 0 400 200")</h1>
<svg width="400" height="200" viewBox="0 0 400 200">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>viwBoxの値がビューポートの倍(width="400" height="200" ViewBox="0 0 800 400")</h1>
<svg width="400" height="200" viewBox="0 0 800 400">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>viwBoxの値がビューポートの半分(width="400" height="200" ViewBox="0 0 200 100")</h1>
<svg width="400" height="200" viewBox="0 0 200 100">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>viwBoxの値がビューポートの倍、かつ最小座標を指定(width="400" height="200" ViewBox="-50 -50 800 400")</h1>
<svg width="400" height="200" viewBox="-50 -50 800 400">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>widthだけ 半分 に(width="400" height="200" ViewBox="0 0 200 200")</h1>
<svg width="400" height="200" viewBox="0 0 200 200">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>heightだけ 半分 に(width="400" height="200" ViewBox="0 0 400 100")</h1>
<svg width="400" height="200" viewBox="0 0 400 100">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>widthだけ 倍 に(width="400" height="200" ViewBox="0 0 800 200")</h1>
<svg width="400" height="200" viewBox="0 0 800 200">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

<h1>heightだけ 倍 に(width="400" height="200" ViewBox="0 0 400 400")</h1>
<svg width="400" height="200" viewBox="0 0 400 400">
  <circle cx="0" cy="0"/>
  <polygon points="0,0 400,0 400,200 0,200"/>
</svg>

              
            
!

CSS

              
                svg{
  background: #f5f5f5;
}

h1{
  font-size: 16px;
}
circle{
  fill: #F44D61;
  r: 20;
}
polygon{
  fill:none;
  stroke: #F4AC56;
  stroke-width: 4;
}
              
            
!

JS

              
                
              
            
!
999px

Console