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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>CSS Multi-column Layout Test Reference: Test column-span:all under HTML details tag</title>
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<style>
details {
column-count: 1;
column-rule: 6px solid;
width: 400px;
outline: 1px solid black;
}
h3 {
/* column-count: 1 makes this behave like a real spanner. */
outline: 1px solid blue;
}
</style>
<body>
<details open>
<summary>Columns</summary>
<h3>spanner</h3>
<div>block</div>
</details>
</body>
</html>