Selector or pseudo-class · data last changed 10 Nov 2026
:focus-within in email clients
Works in 6 of 21. Not supported in Gmail, Gmail Android, Gmail iOS and 3 more. Partial in Outlook Android and Outlook for Mac. Untested in Outlook iOS, Apple Mail iOS, Yahoo Mail iOS and 4 more.
Your reader in Outlook Classic sees the email without :focus-within, 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 :focus-within in Outlook Classic. Design so the email still reads without it.
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:focus-within 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 365 | Not supported |
| Outlook (New) | Not supported |
| Outlook Classic | Not supported |
| Outlook Android | Partial See caveat 1 |
| Outlook for Mac | Partial See caveat 1 |
| Outlook iOS | Untested |
| Apple Mail iOS | Untested |
| Yahoo Mail iOS | Untested |
| Thunderbird | Untested |
| HEY Mail | Untested |
| Fastmail | Untested |
| Superhuman | Untested |
Works in 6: Apple Mail, Yahoo Mail, Yahoo Mail Android and 3 more. Show all
| Client | Support |
|---|---|
| Apple Mail | Works |
| Yahoo Mail | Works |
| Yahoo Mail Android | Works |
| Samsung Mail | Works |
| Proton Mail | Works |
| AOL Mail | Works |
Caveats (1)
- 1. Outlook Android, Outlook for Mac: Partial. Only supported on type selectors.
Caveats as recorded by caniemail (MIT), one entry per wording.
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