<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> <html lang="en"> <head> <title>Margin Collapsing: clear (simple)</title> <style type="text/css"> table, td { padding: 0; border-spacing: 0; } .comparator { border-spacing: 1em; } .test, .control { border: solid; background: red; } .test .container { display: block; margin: 0; width: 8em; background: lime; } .test .float { float: left; margin: 0; height: 4em; width: 4em; background: aqua; } .test .clear { clear: left; display: block; border: 2em solid yellow; margin-top: 1em; } .control .square { height: 4em; width: 4em; } .control .rectangle { height: 4em; width: 8em; } .control .lime { background: lime; } .control .aqua { background: aqua; } .control .yellow { background: yellow; } </style> </head> <body> <p>The following two squares should be identical.</p> <table class="comparator"> <tr> <td class="test"> <div class="container"> <div class="float"> </div> <div class="clear"> </div> </div> </td> <td class="control"> <table> <tr> <td class="square aqua"></td> <td class="square lime"></td> </tr> <tr> <td colspan="2" class="rectangle yellow"></td> </tr> </table> </td> </tr> </table> </body> </html>