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<!DOCTYPE html>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com" />
<meta name="assert" content="When a floating box has a negative margin negative enough that it pushes the float past the top of the block formatting context, it should render properly."/>
<body>
<div style="width: 50px; height: 50px; background: green;"></div>
</body>