message: docs: lazy loading for sandboxes
diff: <template>
  <iframe
  :src="src"
  - style="width: 100%; height: 500px; border: 0; border-radius: 4px; overflow: hidden; margin-top: 40px"
  + style="width: 100%; height: 500px; border: 0; border-radius: 4px; overflow: hidden"
  :title="title"
  allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
  sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
  + loading="lazy"
  ></iframe>
  </template>
  