<?xml version=β1.0β standalone=βyesβ?> <smil>
<body> <!-- The SMIL <switch> element will process the first child element which tests true and skip past all others. --> <switch> <!-- The system-required attribute tests to see if the user agent supports SVG. If true, then render the file drawing.svg. --> <ref system-required="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" type="image/svg" src="drawing.svg" /> <!-- Else, render the alternate image. --> <img src="alternate_image.jpg" /> </switch> </body>
</smil>