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<!DOCTYPE html>
<meta charset=utf-8>
<title>valid imagesrcset & imagesizes</title>
<link rel=preload as=image imagesrcset="image.jpg 1225w" imagesizes="(max-width: 579.98px) 85vw, 50vw">
<link rel=preload as=image imagesrcset="image.jpg 1x">
<link rel=preload as=image href="image.png" imagesrcset="image.jpg 2x">