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chromium/third_party/blink/web_tests/fast/gradients/unprefixed-list-item-gradient.html 

<html>
<head>
<style>
/* List item should be a 1em by 1em round gradient bullet. */
ul { list-style-image: radial-gradient(closest-side, red, blue 99%, transparent 100%); }
</style>
</head>
<body>
<ul>
<li>&nbsp;
<li>&nbsp;
<li>&nbsp;
</ul>