pseudo-class-active
CSS property · 4 supported, 2 partial, 8 unsupported across 15 clients
Client Support
| Client | Category | Engine | Support |
|---|---|---|---|
| Gmail | webmail | Gmail Web | Unsupported |
| Gmail Android | mobile | Gmail Mobile | Unsupported |
| Gmail iOS | mobile | Gmail Mobile | Unsupported |
| Outlook 365 | webmail | Outlook Web | Partial |
| Outlook (New) | desktop | Outlook Web | Unsupported |
| Outlook Classic | desktop | Microsoft Word | Unsupported |
| Outlook iOS | mobile | Outlook Mobile | Unsupported |
| Outlook Android | mobile | Outlook Mobile | Supported |
| Apple Mail | desktop | WebKit | Partial |
| Apple Mail iOS | mobile | WebKit | Unsupported |
| Yahoo Mail | webmail | Yahoo | Supported |
| Samsung Mail | mobile | Samsung | Unsupported |
| Thunderbird | desktop | Gecko | Supported |
| HEY Mail | webmail | WebKit | Supported |
| Superhuman | desktop | Blink | Unknown |
Client-by-client behaviour for pseudo-class-active
Fully supports pseudo-class-active (4): Outlook Android, Yahoo Mail, Thunderbird, HEY Mail.
Partial support (2): Outlook 365, Apple 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 (8): Gmail, Gmail Android, Gmail iOS, Outlook (New), Outlook Classic, Outlook iOS, Apple Mail iOS, Samsung Mail. Plan fallbacks for these clients before relying on pseudo-class-active in production sends.
Behaviour unverified in: Superhuman.
Fixes & Workarounds
Gmail
Unsupported"pseudo-class-active" is not supported in this email client.
Gmail Android
Unsupported"pseudo-class-active" is not supported in this email client.
Gmail iOS
Unsupported"pseudo-class-active" is not supported in this email client.
Outlook (New)
Unsupported"pseudo-class-active" is not supported in this email client.
Outlook Classic
Unsupported"pseudo-class-active" is not supported in this email client.
Outlook iOS
Unsupported"pseudo-class-active" is not supported in this email client.
Apple Mail iOS
Unsupported"pseudo-class-active" is not supported in this email client.
Samsung Mail
Unsupported"pseudo-class-active" is not supported in this email client.
Outlook 365
Partial"pseudo-class-active" is not supported in this email client.
Apple Mail
Partial"pseudo-class-active" is not supported in this email client.
Related Features
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Try Emailens FreeSupport data last updated Apr 27, 2026 · synced from caniemail.com via @emailens/engine.