border-inline & border-block longhand properties
Support for border-inline & border-block longhand properties.
Outlook
Windows
2013
2016
2019
2021
Windows Mail
2022-07
macOS
2011
2016
16.80
Outlook.com
2022-07
iOS
2022-07
Android
2022-07
Samsung Email
Android
10
11
Mozilla Thunderbird
macOS
60.3
Fastmail
Desktop Webmail
2022-07
HEY
Desktop Webmail
2022-07
LaPoste.net
Desktop Webmail
2022-07
1&1
Desktop Webmail
2022-09
Android
2022-09
Mail.ru
Desktop Webmail
2022-07
WP.pl
Desktop Webmail
2025-09