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chromium/third_party/blink/web_tests/paint/invalidation/box/margin-expected.html 

<!DOCTYPE HTML>
<style>
body {
    margin: 0;
}
div {
    width: 100px;
    height: 100px;
    position: absolute;
    background-color: green;
    margin: 20px;
}
</style>
<div id="target"></div>