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<!DOCTYPE html>
<meta charset="utf-8">
<title>Bug 1219985: Reference for a regular (non-opaque) canvas with a green square rendered in it. The red background behind the canvas is visible.</title>
<div style="width: 200px; height: 200px; background: red; display: flex;">
<div style="width: 100px; height: 100px; margin: auto; background: green;"></div>
</div>