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chromium/third_party/blink/web_tests/fast/css-grid-layout/painting-item-marginbox-overflowing-grid-area-expected.html 

<!DOCTYPE html>

<p>Test PASS if you see two adjacent iframes with a 50x50 green square.</p>

<iframe height="120px" width="300px" srcdoc="
     <div style='background: green;  width: 50px; height: 50px; margin-left: 100px;'></div>
     ">
</iframe>

<iframe height="120px" width="300px" srcdoc="
     <div style='background: green; width: 50px; height: 50px; margin-left: 134px;'></div>
     ">
</iframe>