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Does CSS clamp() Work in HTML Email?
Support for the CSS `clamp()` function.
Quick Answer
Does clamp() work in HTML email?
The CSS clamp() property is supported in Gmail, Apple Mail, Thunderbird, ProtonMail. It is NOT supported in Outlook (Windows), Outlook (Mac / Web), Yahoo! Mail, and others. Always include a safe fallback for unsupported clients.
Which Email Clients Support CSS clamp()?
CSS support for clamp() across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✓ Yes | ~ Partial | — |
| Outlook (Windows) | ✗ No | ? | — |
| Outlook (Mac / Web) | ✗ No | ✗ No | — |
| Apple Mail | ✓ Yes | ✓ Yes | — |
| Yahoo! Mail | ✗ No | ✗ No | — |
| Samsung Email | ? | ✗ No | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ✓ Yes | ✓ Yes | — |
| Fastmail | ✗ No | ? | — |
Notes
- #1 Partial. Not supported with non Google accounts.
Frequently Asked Questions
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support clamp().