<!doctype html> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <html><head> <meta charset="utf-8"> <title>Reference: content:none on a :root ruby (blockified) box</title> <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1699964"> <style> html,body { padding:0; margin:0; } body { border: 1px solid; margin: 50px; } </style> </head> <body><x>B</x><x>A</x></body> </html>