Example: Fallback information for multimedia content

This section is non-normative.

In this scenario, fallback content is provided for systems that cannot display multimedia content.

The referenced video provides an image as fallback. If a system does not support video, it will display the image video-not-available.png, which specifies its own alternate text.

<video height="300px"
                loop="false"
                muted="false"
                width="400px">
  <desc>A video that illustrates how to conduct a system health scan.</desc>
  <fallback>
    <image href="video-not-available.png">
      <alt>This video cannot be displayed.</alt>
    </image>
  </fallback>
  <video-poster keyref="demo1-video-poster"
  <media-source href="video.mp4" format="video/mp4"/>
</video>