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chromium/third_party/blink/web_tests/external/wpt/css/printing/animated-image-print.html 

<!doctype html>
<title>Printing animated image</title>
<link rel="help" href="https://html.spec.whatwg.org/#the-img-element">
<link rel="mismatch" href="/css/reference/blank.html">
<img src="/images/anim-gr.gif">