4 <p>You should see two identical gray squares below</p>
5 <svg width="600px" height="500px" xmlns="http://www.w3.org/2000/svg">
7 <filter id="flood" filterUnits="objectBoundingBox" x="0" y="0" width="1" height="1">
8 <feFlood flood-color="rgba(0, 0, 0, 0.4)"/>
11 <filter id="flood-with-alpha" filterUnits="objectBoundingBox" x="0" y="0" width="1" height="1">
12 <feFlood flood-color="rgba(0, 0, 0, 0.8)" flood-opacity="0.5"/>
15 <rect x="0" y="0" width="200" height="200" filter="url(#flood)"/>
16 <rect x="0" y="250" width="200" height="200" filter="url(#flood-with-alpha)"/>