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chromium/chrome/browser/page_load_metrics/integration_tests/data/lcp_breakdown_timings_srcset_images.html 

<!DOCTYPE html>
<title>LCP Breakdown Timings: Images With srcset Tag </title>
<script src="resources/util.js"></script>

<img src="/images/lcp-16x16.png" srcset="/images/lcp-256x256.png, /images/lcp-100x50.png">