foreignObject

html,
body,
svg {
  height: 100%;
}

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <style>
    polygon {
      fill: black;
    }

    div {
      color: white;
      font: 18px serif;
      height: 100%;
      overflow: auto;
    }
  </style>

  <polygon points="5,5 195,10 185,185 10,195" />

  <!-- Common use case: embed HTML text into SVG -->
  <foreignObject x="20" y="20" width="160" height="160">
    <!--
      In the context of SVG embeded into HTML, the XHTML namespace could
      be avoided, but it is mandatory in the context of an SVG document
    -->
    <div xmlns="http://www.w3.org/1999/xhtml">
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed mollis mollis
      mi ut ultricies. Nullam magna ipsum, porta vel dui convallis, rutrum
      imperdiet eros. Aliquam erat volutpat.
    </div>
  </foreignObject>
</svg>