code: function offlineImage(name, width, height) {
    return
      `<?xml version="1.0"?>
  <svg width="${width}" height="${height}" viewBox="0 0 ${width} ${height}" xmlns="http://www.w3.org/2000/svg" version="1.1">
    <g fill="none" fill-rule="evenodd"><path fill="#F8BBD0" d="M0 0h${width}v${height}H0z"/></g>
    <text text-anchor="middle" x="${Math.floor(width / 2)}" y="${Math.floor(height / 2)}">image offline (${name})</text>
  <style><![CDATA[
  text{
    font: 48px Roboto,Verdana, Helvetica, Arial, sans-serif;
  }
  ]]></style>
  </svg>`;
  }
docs: Generates a placeholder SVG image of the given size.