<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <title>CSS Test: CSS Block Box Model: overconstrained horizontal box model and minimum widths</title> <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"> <link rel="alternate" href="http://www.hixie.ch/tests/adhoc/css/box/block/mozilla/001.html" type="text/html"> <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#blockwidth"> <style type="text/css"> .test { border-left: 2em solid; padding-left: 0; width: 3em; padding-right: 0; border-right: 2em solid; -moz-box-sizing: border-box; } .control { border-left: none; padding-left: 0; width: 4em; padding-right: 0; border-right: none; } .body div { background: navy; border-color: navy; height: 1em; } </style> </head> <body class="body"> <p>There must be a perfectly rectangular blue box below.</p> <div class="test"></div> <div class="control"></div> </body> </html>