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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-image-gradient-interpolation-repaint-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<div style="width: 100px; height: 100px; background-image: linear-gradient(in oklch, yellow, blue)"></div>