<h1> to <h6> elements
Support for headings elements in HTML: <h1>
, <h2>
, <h3>
, <h4>
, <h5>
, <h6>
.
Outlook
Windows
2003
2007
2010
2013
2016
2019
Windows 10 Mail
2020-05
macOS
2011
2016
Outlook.com
2020-05
iOS
2020-05
Android
2020-05
Samsung Email
Android
6.0
Mozilla Thunderbird
macOS
68.7
HEY
Desktop Webmail
2020-06
Mail.ru
Desktop Webmail
2020-10