chromium/tools/polymer/tests/html_to_wrapper/icons.html

<iron-iconset-svg name="dummy" size="24">
  <svg>
    <defs>
      <g id="foo"><path d="M12 2C6.48 2 2 6.48 2"></path></g>
    </defs>
  </svg>
</iron-iconset-svg>