<!DOCTYPE html> <html> <head> <title>Bug 1086883</title> <!-- writing mode of #inner div should not affect its position within #outer --> <style> #outer { width:400px; height:300px; padding:50px; border:1px solid black; } #inner { width:200px; height:100px; background:red; } </style> </head> <body> <div id="outer"> <div id="inner"> </div> </div> </body> </html>