<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>CSS Test: Outline-width - outline the box with a -1cm solid outline</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/"> <link rel="help" href="http://www.w3.org/TR/CSS21/ui.html#propdef-outline-width"> <link rel="help" href="http://www.w3.org/TR/CSS21/ui.html#dynamic-outlines"> <meta name="flags" content="invalid"> <meta name="assert" content="The 'outline-width' property does not support a negative length value in centimeters and is ignored."> <style type="text/css"> #test { margin: 1em 0 0 1em; outline: solid green; outline-width: 1em; outline-width: -1cm; width: 300px; } #reference { border: solid green 1em; margin-top: 2em; width: 300px; } </style> </head> <body> <p>Test passes if the two boxes look the same.</p> <div id="test">Filler Text</div> <div id="reference">Filler Text</div> </body> </html>