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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/highlight-styling-003-ref.html 

<!doctype html>
<meta charset="utf-8">
<link rel="author" title="Delan Azabani" href="mailto:[email protected]">
<link rel="stylesheet" href="support/highlights.css">
<style>
    main {
        font-size: 7em;
        margin: 0.5em;
        color: white;
        -webkit-text-fill-color: yellow;
        -webkit-text-stroke-color: green;
        -webkit-text-stroke-width: 4px;
    }
</style>
<p>Test passes if the text below is yellow with a green outline.
<main class="highlight_reftest">quick</main>