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chromium/third_party/blink/renderer/core/paint/test_data/transform-animation.html 

<!DOCTYPE html>
<style>
@keyframes test {
  0% { transform: translate(1em, 1em) }
  100% { transform: translate(2em, 2em) }
}

.animate {
  animation-name: test;
  animation-duration: 1s;
}
</style>
<div id="target" class="animate"></div>;