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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Paint containment stacking context</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="match" href="../reference/nothing.html">
<meta name=assert content="Elements in which paint containment doesn't apply, do not create a stacking context.">
<style>
rt {
display: ruby-text;
contain: paint;
background: white;
overflow: hidden;
}
span {
position: relative;
z-index: -1;
}
</style>
<p>There should be nothing below.</p>
<ruby><rt><span>FAIL</span></rt></ruby>