LayoutTests/css3/filters/filters-on-svg-element.html

<style>
rect {
    filter: blur(0);
}
</style>
<svg viewBox="0 0 20 20" width="100px" height="100px">
    <rect width="20" height="20" fill="red"/>
    <circle cx="10" cy="10" r="8"/>
</svg>