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