oval要素のCSSのvisibility属性のサンプル
指定なし
<v:oval style="width:200; height:100;" />
visibleを指定
<v:oval style="width:200; height:100; visibility:visible;" />
hiddenを指定
<v:oval style="width:200; height:100; visibility:hidden;" />
inheritを指定
<v:oval style="width:200; height:100; visibility:inherit;" />