<!DOCTYPE html> <html> <head> <link rel="author" title="Google Inc." href="http://www.google.com/"> <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> <style> #circles, #circles div { border: 1em solid blue; border-radius:50%; margin: auto; } #circles { width:9em; height:9em; } </style> </head> <body> <p>These tests are from the spec: <a href="http://dev.w3.org/csswg/css3-flexbox/#auto-margins">http://dev.w3.org/csswg/css3-flexbox/#auto-margins</a>.</p> <p>The black rectangle should be centered vertically and horizontally.</p> <div style="width: 4em; height: 4em; background: silver"> <table style="width: 100%; height: 100%;"><tr><td style="text-align: center; font-family: Ahem;">OK</td></tr></table> </div> <div style="width: 4em; height: 4em; margin-top: 10px; background: silver; writing-mode: vertical-rl"> <table style="width: 100%; height: 100%;"><tr><td style="text-align: center; font-family: Ahem;">OK</td></tr></table> </div> <p>You should see 3 blue concentric circles.</p> <div id="circles"> <div style="width: 5em; height: 5em; margin-top: 1em;"> <div style="width: 1em; height: 1em; margin-top: 1em;"></div> </div> </div> <p>The computed style of each margin should not be 0.<br>OK: PASS<br>Vertical OK: PASS</p> </body> </html>