chromium/third_party/blink/web_tests/paint/roundedrects/circle-with-shadow.html

<!DOCTYPE html>
<style>
.circle{
    width: 300px;
    height: 300px;
    border-radius: 51%;
    box-shadow: black 0 0 1px 1.99px;
}
</style>
There should be a ~2px shadow around the circle.
<div class="circle"> </div>