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chromium/third_party/blink/web_tests/http/tests/devtools/elements/highlight/resources/highlight-svg-content-iframe.html 

<html>
<head>
<style>
body {
    margin: 0;
}
</style>
</head>

<body>
<svg width="200px" height="200px">
    <rect id="svg-rect" x="30" y="70" width="60" height="80" stroke="none"></rect>
</svg>
</body>