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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/highlight-text-cascade-ref.html 

<!DOCTYPE html>
<html>
<head>
    <style>
        #style1 {
            background-color: yellow;
            color:green;
        }
        #style2 {
            background-color: blue;
            color:red;
        }
        #style3 {
            background-color: purple;
            color:pink;
        }
    </style>
</head>
<body>
    <div id="out"><span id="text1"><span id="style1">One</span> two three</span></div>
    <div id="scoped"><span id="text2">four <span id="style2">five</span> six</span></div>
    <span id="text3">seven eight nine</span>
</body>
</html>