<canvas>
<button onclick="vw.setAttribute('width', 200)">Expand Width</button>
<button x="120" onclick="vw.setAttribute('width', 100)">Reset</button>
<view id="vw" y="30" width="100" height="100">
<!-- onwidth is sent anytime width is changed -->
<handler name="onwidth">
this.setAttribute('bgcolor', (this.width > 300 ? lz.colors.red : lz.colors.blue));
</handler>
</view>
</canvas>