CSS property · data last changed 10 Nov 2026
[aria-describedby] in email clients
Works in 9 of 21. Not supported in Gmail, Gmail Android, Gmail iOS and 8 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 Outlook Classic
There is no drop-in fix for [aria-describedby] in Outlook Classic. Design so the email still reads without it.
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[aria-describedby] is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| Gmail | Not supported See caveat 1 |
| Gmail Android | Not supported |
| Gmail iOS | Not supported |
| Outlook Classic | Not supported |
| Yahoo Mail | Not supported |
| Yahoo Mail Android | Not supported |
| Yahoo Mail iOS | Not supported |
| Thunderbird | Not supported |
| HEY Mail | Not supported |
| AOL Mail | Not supported |
| Fastmail | Not supported See caveat 1 |
| Superhuman | Untested |
Works in 9: Outlook 365, Outlook (New), Outlook iOS and 6 more. Show all
| Client | Support |
|---|---|
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook iOS | Works |
| Outlook Android | Works |
| Outlook for Mac | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Samsung Mail | Works |
| Proton Mail | Works |
Caveats (1)
- 1. Gmail, Fastmail: Buggy.
idprefix mismatched. Theidvalue is prefixed but not thearia-describedbyvalue.
Caveats as recorded by caniemail (MIT), one entry per wording.
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