Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <body> <h4>Without cellspacing:</h4> <table border="1"> <tr> <td>First</td> <td>Row</td> </tr> <tr> <td>Second</td> <td>Row</td> </tr> </table> <h4>With cellspacing="0":</h4> <table border="1" cellspacing="0"> <tr> <td>First</td> <td>Row</td> </tr> <tr> <td>Second</td> <td>Row</td> </tr> </table> <h4>With cellspacing="10":</h4> <table border="1" cellspacing="10"> <tr> <td>First</td> <td>Row</td> </tr> <tr> <td>Second</td> <td>Row</td> </tr> </table> </body> </html>
Result:
W3Schools.com - Try it yourself