rect-path

rect

<svg width="120" height="400" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120 400">
  <rect x="0" y="0" width="100" height="400" fill="pink"></rect>
  <rect x="10" y="10" width="80" height="380" fill="red"></rect>
  <rect x="10" y="150" width="80" height="240" fill="blue"></rect>
</svg>

path

<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
  <rect x="0" y="0" width="100" height="100" fill="pink"></rect>
  <path d="M 0 0 L 100 0 L 50 100 Z" fill="orange" stroke="black" stroke-width="2"/>
</svg>