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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS-contain test: layout containment and forced breaks</title>
<link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<meta content="forced breaks within layout containment do not propagate to the parent." name="assert">
<link href="reference/contain-layout-breaks-002-ref.html" rel="match">
<style>
article
{
column-fill: auto; /* columns are filled sequentially */
column-gap: 0em;
columns: 2 100px; /* 2 columns each 100px wide */
float: left; /* to make multi-column element shrink-wrap */
height: 400px; /* give more than enough to go wrong */
}
div#yellow-normal
{
border-top: yellow solid 100px;
}
div#blue-parent
{
border-top: blue solid 100px;
contain: layout;
}
div#orange-child
{
border-top: orange solid 100px;
break-before: column;
}
</style>
<p>Test passes if there is a) a blue square below a yellow square and b) an orange square below a blue square.
<article>
<div id="yellow-normal"></div>
<div id="blue-parent">
<div id="orange-child"></div>
</div>
</article>