CSS property · data last changed 10 Nov 2026
pseudo-class-active in email clients
Works in 8 of 21. Not supported in Gmail, Gmail Android, Gmail iOS and 5 more. Partial in Outlook 365, Outlook (New), Outlook for Mac and 1 more. Untested in Superhuman.
Your reader in Outlook Classic sees the email without pseudo-class-active, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
There is no drop-in fix for pseudo-class-active in Outlook Classic. Design so the email still reads without it.
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pseudo-class-active 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 |
| Gmail Android | Not supported |
| Gmail iOS | Not supported |
| Outlook Classic | Not supported |
| Outlook iOS | Not supported |
| Apple Mail iOS | Not supported |
| Samsung Mail | Not supported |
| AOL Mail | Not supported |
| Outlook 365 | Partial See caveat 1 |
| Outlook (New) | Partial See caveat 1 |
| Outlook for Mac | Partial See caveat 1 |
| Apple Mail | Partial See caveat 2 |
| Superhuman | Untested |
Works in 8: Outlook Android, Yahoo Mail, Yahoo Mail Android and 5 more. Show all
| Client | Support |
|---|---|
| Outlook Android | Works |
| Yahoo Mail | Works |
| Yahoo Mail Android | Works |
| Yahoo Mail iOS | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| Proton Mail | Works |
| Fastmail | Works |
Caveats (2)
- 1. Outlook 365, Outlook (New), Outlook for Mac: Partial. Only supported on type selectors.
- 2. Apple Mail: Partial. Supported with mouse clicks. Not supported with keyboard input.
Caveats as recorded by caniemail (MIT), one entry per wording.
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