<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> <html lang="en"> <head> <title>CSS Block Box Model: overconstrained horizontal box model and minimum widths</title> <style type="text/css"> .container { width: 3em; } .test { margin-left: 2em; border-left: none; padding-left: 0; width: auto; padding-right: 0; border-right: none; margin-right: 2em; } .control { padding-left: 2em; } div { font-size: xx-large; } </style> </head> <body> <p>The following two vertical bars should be at the same horizontal position.</p> <div class="container"> <div class="test"><span>|</span></div> </div> <div class="control"><span>|</span></div> </body> </html>