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chromium/third_party/blink/web_tests/external/wpt/css/css-content/element-replacement-alt.html 

<!DOCTYPE html>
<title>The content CSS property with a broken image doesn't pull the alt attribute from that element</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="match" href="element-replacement-alt-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-content-3/#content-property">
<div style="content: url(broken);" alt="Alt text">FAIL</div>