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chromium/third_party/blink/web_tests/fast/clip/overflow-border-radius-composited-parent.html 

<!DOCTYPE html>
<head>
<style>
.outer {
    border: 10px solid black;
    border-radius: 100px;
    overflow: hidden;
    width: 200px;
    height: 100px;
    margin: 10px;
    display: inline-block;
    will-change: transform;
}
.inner {
    background: #808080;
    width: 100%;
    height: 100%;
    color: #FFFFFF;
    transform: rotate(45deg);
    will-change: transform;
}
</style>
</head>
<body>
The white text and grey backgrounds should all clip to the border-radius.
<br>

<!-- static container -->
<div class="outer" style="position: static;">
    <div class="inner" style="position: static;">
        static &gt; static
    </div>
</div>

<div class="outer" style="position: static;">
    <div class="inner" style="position: relative;">
        static &gt; relative
    </div>
</div>

<!-- relative container -->
<div class="outer" style="position: relative;">
    <div class="inner" style="position: static;">
        relative &gt; static
    </div>
</div>

<div class="outer" style="position: relative;">
    <div class="inner" style="position: relative;">
        relative &gt; relative
    </div>
</div>
<br>
<div class="outer" style="position: relative;">
    <div class="inner" style="position: absolute;">
        relative &gt; absolute
    </div>
</div>