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chromium/third_party/blink/renderer/core/testing/data/compositor-proxy-plumbing-no-proxies.html 

<!DOCTYPE HTML>
<style>
#proxied {
    width: 50px;
    height: 50px;
    background: papayawhip;
}
#proxied-scroller {
    width: 100px;
    height: 100px;
    overflow: scroll;
    border: 1px solid black;
}
#scrolled {
    width: 50px;
    height: 1000px;
    background: papayawhip;
}
#tall {
    width: 50px;
    height: 2000px;
    background: papayawhip;
}

</style>
<div id="proxied"></div>
<div id="proxied-scroller">
  <div id="scrolled"></div>
</div>
<div id="tall"></div>