CSS function · data last changed 10 Nov 2026
min in email clients
Works in 6 of 21. Not supported in Outlook 365, Outlook (New), Outlook Classic and 8 more. Partial in Gmail Android, Gmail iOS and Samsung Mail. Untested in Superhuman.
Your reader in Outlook Classic sees the email without min, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
Provide a literal fallback value before any min() declaration. Reserve min() for refinements where the absence of clamping is non-critical.
There is no drop-in fix for min in Outlook Classic. Design so the email still reads without it.
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min is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| Outlook 365 | Not supported |
| Outlook (New) | Not supported |
| Outlook Classic | Not supported |
| Outlook iOS | Not supported |
| Outlook Android | Not supported |
| Outlook for Mac | Not supported |
| Yahoo Mail | Not supported |
| Yahoo Mail Android | Not supported |
| Yahoo Mail iOS | Not supported |
| AOL Mail | Not supported |
| Fastmail | Not supported |
| Gmail Android | Partial See caveat 1 |
| Gmail iOS | Partial See caveat 1 |
| Samsung Mail | Partial See caveat 2 |
| Superhuman | Untested |
Works in 6: Gmail, Apple Mail, Apple Mail iOS and 3 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| Proton Mail | Works |
Caveats (2)
- 1. Gmail Android, Gmail iOS: Partial. Not supported with non Google accounts.
- 2. Samsung Mail: Partial. Not supported with Microsoft accounts.
Caveats as recorded by caniemail (MIT), one entry per wording.
How min behaves
The min() CSS function returns the smallest of a set of values and is used to cap a property at a maximum. Modern Apple Mail and webmail clients support it; Outlook Classic ignores it. Like calc() and clamp(), min() is best treated as a progressive enhancement with a literal fallback.
- Outlook Classic ignores min() entirely.
- Apple Mail supports min() reliably in recent macOS and iOS releases.
- Gmail's support varies between mobile and desktop builds.
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