HTML Elements

<marquee>

HTML element · 9 supported, 5 partial, 6 unsupported across 21 clients

9 of 21 email clients render <marquee> fully (Oct 14, 2026 data); it breaks outright in Gmail, Gmail Android, Gmail iOS and 3 more.

0/7 webmail, 3/6 desktop, 6/8 mobile clients support <marquee> fully.
Unsupported in Gmail, Gmail Android, Gmail iOS, Outlook Classic and 2 more.
Partial in Outlook 365, Outlook (New), Yahoo Mail, Proton Mail and 1 more, behavior differs from browsers, test before relying on it.
Outlook Classic (Word engine, supported to at least 2029) does not fully support <marquee>, and its replacement changes little here; see the deprecation diff.
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 Apr 21, 2020, synced by Emailens Oct 14, 2026.

Client Support

Client	Category	Engine	Support
Gmail	webmail	Gmail Web	Unsupported
Gmail Android	mobile	Gmail Mobile	Unsupported
Gmail iOS	mobile	Gmail Mobile	Unsupported
Outlook 365	webmail	Outlook Web	Partial^{See caveat 1}
Outlook (New)	desktop	Outlook Web	Partial^{See caveat 1}
Outlook Classic	desktop	Microsoft Word	Unsupported
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	Partial^{See caveat 2}
Yahoo Mail Android	mobile	Yahoo	Supported
Yahoo Mail iOS	mobile	Yahoo	Supported
Samsung Mail	mobile	Samsung	Supported
Thunderbird	desktop	Gecko	Supported
HEY Mail	webmail	WebKit	Unsupported
Proton Mail	webmail	Proton	Partial^{See caveat 3}
AOL Mail	webmail	AOL	Partial^{See caveat 2}
Fastmail	webmail	Fastmail	Unsupported
Superhuman	desktop	Blink	Unknown

Documented caveats (3)

1.Outlook 365, Outlook (New): The <marquee> element is supported but not the behavior or direction attributes.
2.Yahoo Mail, AOL Mail: The <marquee> element is supported but the animation doesn't play in Internet Explorer or Firefox.
3.Proton Mail: The behavior attribute is not supported.

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

Client-by-client behaviour for <marquee>

Fully supports <marquee> (9): Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird.

Partial support (5): Outlook 365, Outlook (New), Yahoo Mail, Proton Mail, AOL Mail. Expect rendering quirks unique to each engine. Partial support typically means a subset of values, an ignored shorthand, or sanitizer-specific rewrites.

No support (6): Gmail, Gmail Android, Gmail iOS, Outlook Classic, HEY Mail, Fastmail. Plan fallbacks for these clients before relying on <marquee> in production sends.

Check your own HTML for <marquee>

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Zero-Friction Engine Preview

Test your <marquee> layout across 21 email clients

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Last tested upstream: Apr 21, 2020 · Last synced by Emailens: Oct 14, 2026

caniemail.com (MIT) records Apr 21, 2020 as the last time <marquee> was tested in a real client, 6 years before this sync. Syncing copies that result forward, it does not re-test it. Carried in @emailens/engine data v0.14.5.