<!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="help" href="https://drafts.csswg.org/css-contain-1/#containment-paint"> <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>