1<?xml version="1.0" standalone="yes"?> 2<smil> 3 <body> 4<!-- The SMIL <switch> element will process the 5 first child element which tests true and skip 6 past all others. --> 7 <switch> 8<!-- The system-required attribute tests to see if 9 the user agent supports SVG. If true, then 10 render the file drawing.svg. --> 11 <ref system-required="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" type="image/svg" src="drawing.svg"/> 12<!-- Else, render the alternate image. --> 13 <img src="alternate_image.jpg"/> 14 </switch> 15 </body> 16</smil> 17
