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Does CSS ex unit Work in HTML Email?
Support for ex unit, relative to the height of an 'x'.
Quick Answer
Does ex unit work in HTML email?
The CSS ex unit property is supported in all major email clients tested. You can use it with confidence in your HTML emails.
Which Email Clients Support CSS ex unit?
CSS support for ex unit across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✓ Yes | ✓ Yes | — |
| Outlook (Windows) | ✓ Yes | ? | — |
| Outlook (Mac / Web) | ✓ Yes | ✓ Yes | — |
| Apple Mail | ✓ Yes | ✓ Yes | — |
| Yahoo! Mail | ✓ Yes | ✓ Yes | — |
| Samsung Email | ? | ✓ Yes | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ✓ Yes | ✓ Yes | — |
| Fastmail | ✓ Yes | ? | — |
Frequently Asked Questions
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support ex unit.