animation-in-main-frame.html | Explore in Territory

<!DOCTYPE html>
<style>
@keyframes font {
  0% { font-size: 12px;}
  100% {font-size: 24px;}
}
div {
  animation: font 2s infinite;
}
</style>
<div>Animated</div>
<iframe src="data:text/html,Test page"></iframe>

chromium/third_party/blink/renderer/core/animation/test_data/animation-in-main-frame.html