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Test Info:
<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<style>
body {
width: 400px;
}
div#float {
float: left;
width: 200px;
height: 400px;
background-color: lightgreen;
}
details {
float: left;
background-color: orange;
}
summary {
background-color: green;
/* Hide the triangle for comparing with div in reftest. */
list-style-type: none;
}
</style>
<body>
<details open>
<summary>Summary</summary>
<div id="float"></div>
</details>
</body>
</html>