CSS property · data last changed 10 Nov 2026
[lang] in email clients
Works in 15 of 21. Not supported in HEY Mail. Partial in Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS and 1 more. Untested in Superhuman.
Safe to leave in: where it is not supported, the email renders the same.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in HEY Mail
There is no drop-in fix for [lang] in HEY Mail. Design so the email still reads without it.
No signup · Five clients free, Outlook Classic included · All 21 with an account
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[lang] is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| HEY Mail | Not supported |
| Yahoo Mail | Partial See caveat 1 |
| Yahoo Mail Android | Partial See caveat 1 |
| Yahoo Mail iOS | Partial See caveat 1 |
| AOL Mail | Partial See caveat 1 |
| Superhuman | Untested |
Works in 15: Gmail, Gmail Android, Gmail iOS and 12 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Gmail Android | Works |
| Gmail iOS | Works |
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook Classic | Works |
| Outlook iOS | Works |
| Outlook Android | Works |
| Outlook for Mac | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Samsung Mail | Works |
| Thunderbird | Works |
| Proton Mail | Works |
| Fastmail | Works |
Caveats (1)
- 1. Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail: Not supported on
<td>elements.
Caveats as recorded by caniemail (MIT), one entry per wording.
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