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Test Info:
<!DOCTYPE html>
<html>
<style>
@keyframes anim {
from { background-color: rgba(0, 0, 0, 0); }
to { background-color: rgba(255, 0, 0, 255); }
}
body {
animation: anim 100s;
width: 100vw;
height: 100vh;
}
</style>