HTML & Email Structure

anchor-links

CSS property · 12 supported, 1 partial, 7 unsupported across 21 clients

12 of 21 email clients render anchor-links fully (Sep 2, 2026 data); it breaks outright in Gmail iOS, Yahoo Mail Android, Yahoo Mail iOS and 4 more.

3/7 webmail, 5/6 desktop, 4/8 mobile clients support anchor-links fully.
Unsupported in Gmail iOS, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail and 3 more.
Partial in Yahoo Mail, 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 Aug 8, 2019, synced by Emailens Sep 2, 2026.

Client Support

Client	Category	Engine	Support
Gmail	webmail	Gmail Web	Supported^{See caveat 1}
Gmail Android	mobile	Gmail Mobile	Supported^{See caveat 2}
Gmail iOS	mobile	Gmail Mobile	Unsupported^{See caveat 3}
Outlook 365	webmail	Outlook Web	Supported
Outlook (New)	desktop	Outlook Web	Supported^{See caveat 1}
Outlook Classic	desktop	Microsoft Word	Supported^{See caveat 1}
Outlook iOS	mobile	Outlook Mobile	Supported
Outlook Android	mobile	Outlook Mobile	Supported
Outlook for Mac	desktop	WebKit	Supported
Apple Mail	desktop	WebKit	Supported^{See caveat 2}
Apple Mail iOS	mobile	WebKit	Supported
Yahoo Mail	webmail	Yahoo	Partial^{See caveat 1}
Yahoo Mail Android	mobile	Yahoo	Unsupported^{See caveat 3}
Yahoo Mail iOS	mobile	Yahoo	Unsupported^{See caveat 4}
Samsung Mail	mobile	Samsung	Unsupported^{See caveat 3}
Thunderbird	desktop	Gecko	Supported
HEY Mail	webmail	WebKit	Unsupported
Proton Mail	webmail	Proton	Unsupported
AOL Mail	webmail	AOL	Unsupported
Fastmail	webmail	Fastmail	Supported
Superhuman	desktop	Blink	Unknown

Documented caveats (4)

1.Gmail, Outlook (New), Outlook Classic, Yahoo Mail: Partial. Works when targeting an empty anchor with the corresponding name attribute, but not with id attributes.
2.Gmail Android, Apple Mail: Buggy. Targeted content is partially hidden by the application UI on top.
3.Gmail iOS, Yahoo Mail Android, Samsung Mail: Buggy. Clicking an anchor link does nothing.
4.Yahoo Mail iOS: Buggy. Opens a new in-app browser window on yahoo.com with the anchor appended to the URL.

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

Client-by-client behaviour for anchor-links

Fully supports anchor-links (12): Gmail, Gmail Android, Outlook 365, Outlook (New), Outlook Classic, Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Thunderbird, Fastmail.

Partial support (1): Yahoo 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 (7): Gmail iOS, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, HEY Mail, Proton Mail, AOL Mail. Plan fallbacks for these clients before relying on anchor-links in production sends.

Behaviour unverified in: Superhuman.