<html> <head> <title>default box sizing (border-collapse: separate, standards mode)</title> <style type="text/css"> body > div { float: left; clear: left; background: fuchsia; margin: 2px 0; } div.inner { background: yellow; } </style> </head> <body> <div style="width: 200px"> <div style="background: blue; padding: 2px 3px 4px 5px"> <div style="background: fuchsia; padding: 5px 8px 7px 10px"> <div style="background: aqua; padding: 2px 3px 4px 5px"> <div style="background: fuchsia; padding: 5px 7px 9px 11px"> <div class="inner">x</div> </div> </div> </div> </div> </div> <div> <div style="background: blue; padding: 2px 3px 4px 5px"> <div style="background: fuchsia; padding: 5px 8px 7px 10px"> <div style="background: aqua; padding: 2px 3px 4px 5px"> <div style="background: fuchsia; padding: 5px 7px 9px 11px"> <div class="inner" style="width: 200px">x</div> </div> </div> </div> </div> </div> </body> </html>