<!doctype html> <html lang=en> <meta charset=utf-8> <title>CSS-contain test: layout containment on body prevents text-orientation propagation</title> <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net"> <meta name=flags content=""> <meta name=assert content="layout containment on body prevents text-orientation propagation"> <link rel="match" href="reference/contain-body-t-o-001-ref.html"> <link rel=help href="https://drafts.csswg.org/css-contain-1/#contain-property"> <style> html { writing-mode: vertical-lr; direction: rtl; width: 100vw; height: 100vh; overflow: hidden; } body { margin: 0; border-top: 100px solid red; border-bottom: 100px solid green; width: 100vw; height: 100vh; text-orientation: upright; contain: layout; } p { margin: auto; padding: 150px 0; writing-mode: horizontal-tb; direction: ltr; } </style> <p>Test passes if there is no red.