An example of showing a svg file, with a gif as fallback if the device does not support svg
The code:
<object type="image/svg+xml" data="gfx/iama_svg.svg" id="o1" width="200" height="50">
<object type="image/gif" data="gfx/iama_gif.gif" id="o1" width="200" height="50"></object>
</object>