outline
Sets a line outside of the element’s border.
Outlook
Windows
2007
2010
2013
2016
2019
Windows Mail
2022-03
macOS
16.60
Outlook.com
2022-03
iOS
2022-03
Android
2022-03
Samsung Email
Android
6.0
Mozilla Thunderbird
macOS
78.14
Fastmail
Desktop Webmail
2022-03
HEY
Desktop Webmail
2022-03
LaPoste.net
Desktop Webmail
2022-03
Mail.ru
Desktop Webmail
2022-03