<!doctype html> <html lang=en> <meta charset=utf-8> <title>CSS-contain test: layout containment on html prevents background propagation</title> <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net"> <meta name=flags content=""> <meta name=assert content="layout containment on html prevents background propagation"> <link rel="match" href="reference/contain-body-bg-001-ref.html"> <link rel=help href="https://drafts.csswg.org/css-contain-1/#contain-property"> <style> html, body, p { margin: 0; width: 300px; height: 200px; } p { background: white; } body { background: red; } html { contain: layout; } </style> <p>Test passes if there is no red.