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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-image-outset-003.html 

<!doctype html>
<meta charset="utf-8">
<title>Background Image Outset</title>
<link rel="match" href="border-image-outset-003-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-image-outset" />
<style>
    #a {
        width: 300px;
        height: 200px;
        position: absolute;
        left: 200px;
        top: 150px;
        border-width: 50px;
        border-style: solid;
        border-image: linear-gradient(green, green);
        background-color: blue;
        background-clip: content-box;
        border-image-outset: 50px 10px 50px 100px;
        border-image-slice: 33%;
    }
</style>
<div id="a"></div>