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Does CSS overflow Work in HTML Email?
Sets the desired behavior when content does not fit in the element's padding box
Quick Answer
Does overflow work in HTML email?
The CSS overflow property is supported in Samsung Email, Thunderbird, Fastmail. It is NOT supported in Outlook (Windows). Always include a safe fallback for unsupported clients.
Which Email Clients Support CSS overflow?
CSS support for overflow across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ~ Partial | ~ Partial | — |
| Outlook (Windows) | ✗ No | ? | — |
| Outlook (Mac / Web) | ~ Partial | ~ Partial | — |
| Apple Mail | ~ Partial | ~ Partial | — |
| Yahoo! Mail | ~ Partial | ~ Partial | — |
| Samsung Email | ? | ✓ Yes | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ~ Partial | ~ Partial | — |
| Fastmail | ✓ Yes | ? | — |
Notes
- #1 Buggy. Cannot scroll through to hidden content.
- #2 Not supported. `overflow` is replaced by `java-script`.
- #3 Partial. Support for `overflow-block` & `overflow-inline` depends on browser support.
- #4 Partial. `overflow-block` & `overflow-inline` not supported.
Frequently Asked Questions
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support overflow.