LayoutTests/svg/custom/visibility-override-filter.svg

<svg xmlns="http://www.w3.org/2000/svg">
    <defs>
        <filter id="myfilter" filterUnits="objectBoundingBox" x="0%" y="0%" width="100%" height="100%">
            <feFlood flood-color="green" flood-opacity="1"/>
        </filter>
    </defs>

    <rect fill="red" height="100px" width="100px"/>
    <g visibility='hidden' filter='url(#myfilter)'>
        <rect fill="red" height="100px" width="100px"/>
    </g>
</svg>