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<style>
@keyframes opacity {
0% {opacity: 0;}
1% {opacity: 0.5;}
100% {opacity: 0.5;}
}
rect {
animation-duration: 50s;
animation-name: opacity;
animation-iteration-count: 1;
}
</style>
<rect width="100" height="100" fill="green" stroke="black" stroke-width="6"/>
</svg>