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chromium/third_party/blink/renderer/core/animation/test_data/inactive-animations.html 

<!DOCTYPE html>
<style>
@keyframes font {
  0% { font-size: 12px; }
  100% { font-size: 24px; }
}
.font {
  animation: font 2s infinite;
  animation-play-state: paused;
}
@keyframes transform {
  0% { transform: translateX(0); }
  100% { transform: translateX(100px); }
}
.font {
  animation: font 60s forwards;
}
.transform {
  animation: transform 60s forwards;
}
.paused {
  animation-play-state: paused;
}
.finished {
  animation-delay: -60s;
}
</style>
<div class="paused font">Paused font animation</div>
<div class="paused transform">Paused transform animation</div>
<div class="finished font">Finished font animation</div>
<div class="finished transform">Finished transform animation</div>