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chromium/third_party/blink/web_tests/http/tests/images/image-with-dpr-header.html 

<!DOCTYPE html>
<body>
<!-- DPR in header -->
<img src="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=4.0">
<!-- fractional DPR -->
<img src="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=2.5">
<!-- DPR smaller than 1 -->
<img src="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=0.5">
<!-- DPR in srcset -->
<img srcset="http://127.0.0.1:8000/resources/square100.png 4x">
<!-- invalid DPR in header -->
<img src="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=xx">
<!-- combine header with srcset -->
<img srcset="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=xx 4x">
<img srcset="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=4.0 2x">
<!-- explicit width also given -->
<img src="http://127.0.0.1:8000/resources/dpr.php?name=square100.png&mimeType=image/png&dpr=4.0"
     width="100" height="100">

</body>
</html>