CSS Properties

height

CSS property · 16 supported, 1 partial, 4 unsupported across 21 clients

16 of 21 email clients render height fully (Sep 2, 2026 data); it breaks outright in Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS and 1 more.

5/7 webmail, 5/6 desktop, 6/8 mobile clients support height fully.
Unsupported in Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail.
Partial in Outlook (New), behavior differs from browsers, test before relying on it.
Across all clients, only 6 of 298 tracked HTML/CSS features render identically everywhere.

Source: caniemail.com (MIT), via the Emailens engine. Last tested upstream Sep 27, 2019, synced by Emailens Sep 2, 2026.

Client Support

Client	Category	Engine	Support
Gmail	webmail	Gmail Web	Supported
Gmail Android	mobile	Gmail Mobile	Supported
Gmail iOS	mobile	Gmail Mobile	Supported
Outlook 365	webmail	Outlook Web	Supported
Outlook (New)	desktop	Outlook Web	Partial^{See caveat 1}
Outlook Classic	desktop	Microsoft Word	Supported
Outlook iOS	mobile	Outlook Mobile	Supported
Outlook Android	mobile	Outlook Mobile	Supported
Outlook for Mac	desktop	WebKit	Supported
Apple Mail	desktop	WebKit	Supported
Apple Mail iOS	mobile	WebKit	Supported
Yahoo Mail	webmail	Yahoo	Unsupported^{See caveat 2}
Yahoo Mail Android	mobile	Yahoo	Unsupported^{See caveat 2}
Yahoo Mail iOS	mobile	Yahoo	Unsupported^{See caveat 2}
Samsung Mail	mobile	Samsung	Supported
Thunderbird	desktop	Gecko	Supported
HEY Mail	webmail	WebKit	Supported
Proton Mail	webmail	Proton	Supported
AOL Mail	webmail	AOL	Unsupported^{See caveat 2}
Fastmail	webmail	Fastmail	Supported
Superhuman	desktop	Blink	Supported

Documented caveats (2)

1.Outlook (New): Partial. Not supported on <body>, <span>, <div> or <p> elements.
2.Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail: Buggy. Replaces height by min-height.

Caveats recorded by caniemail.com (MIT) and carried verbatim, one entry per wording rather than per client.

Client-by-client behaviour for height

Fully supports height (16): Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook Classic, Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Fastmail, Superhuman.

Partial support (1): Outlook (New). Expect rendering quirks unique to each engine. Partial support typically means a subset of values, an ignored shorthand, or sanitizer-specific rewrites.

No support (4): Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail. Plan fallbacks for these clients before relying on height in production sends.