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Test Info:

<!DOCTYPE html>
<html>
<head>
<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="Block level iframe is affected by block-step-size">
<style>
.container {
display: flow-root;
width: 100px;
background-color: green;
}
.block-step {
display: block;
block-step-size: 100px;
visibility: hidden;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green square.</p>
<div class="container">
<iframe src="" width="20" height="20" class="block-step"></iframe>
</div>
</body>
</html>