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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
button {
position: absolute;
border: 1px solid blue;
margin: 1px;
padding: 0;
writing-mode: vertical-rl;
}
div {
position: absolute;
background: yellow;
}
</style>
</head>
<body>
<button style="top:0px"><img src="" width="20" height="80"></button>
<button style="top:100px"><img src="" width="80" height="20"></button>
<!-- solid-color <div>s that should completely cover the buttons above,
provided they size themselves properly for their <img> content -->
<div style="top:0px; width:40px; height:90px;"></div>
<div style="top:100px; width:100px; height:40px;"></div>
</body>
</html>