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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <p><b>Note:</b> The dialog tag is currently only supported in Chrome version 37+, Safari 6+ and Opera 24+.</p> <table> <tr> <th>January <dialog open>This is an open dialog window</dialog></th> <th>February</th> <th>March</th> </tr> <tr> <td>31</td> <td>28</td> <td>31</td> </tr> </table> </body> </html>