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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/animations/background-color-animation-fragmented-ref.html 

<!DOCTYPE html>
<div style="columns: 2; width: 200px; height: 100px;">
  <div style="height: 100px; background: rgb(100, 100, 0)"></div>
</div>