cellspacing attribute
Represents the spacing around the individual <th> and <td> elements
Outlook
Windows
2013
2016
2019
2021
Windows Mail
2024-05
macOS
2024-05
Outlook.com
2024-05
2024-01
iOS
2024-05
Android
2024-05
Samsung Email
Android
2024-05
Mozilla Thunderbird
macOS
2024-05
Fastmail
Desktop Webmail
2024-05
HEY
Desktop Webmail
2024-05
LaPoste.net
Desktop Webmail
2024-05
1&1
Desktop Webmail
2024-05
Android
2024-05
Mail.ru
Desktop Webmail
2024-05
WP.pl
Desktop Webmail
2026-02