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Test Info:
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<body>
<div style="display: flex;">
<div style="padding: calc(50%);"></div>
<div style="padding: 4px; flex: 0 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999;"></div>
</div>
</body>
</html>