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chromium/third_party/blink/web_tests/mhtml/relative_url-expected.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Page with square</TITLE>

<BODY>
Image with an absolute URL:<BR>
<IMG src="resources/red_square.png"/>
<br>
Image with a relative URL:<BR>
<IMG src="resources/red_square.png"/>
</BODY></HTML>