Does CSS border-inline & border-block individual logical properties Work in HTML Email?
Support for `border-inline` & `border-block` individual logical properties.
Does border-inline & border-block individual logical properties work in HTML email?
The CSS border-inline & border-block individual logical properties property is supported in Apple Mail, ProtonMail. It is NOT supported in Gmail, Outlook (Windows), Yahoo! Mail. Always include a safe fallback for unsupported clients.
Which Email Clients Support CSS border-inline & border-block individual logical properties?
CSS support for border-inline & border-block individual logical properties 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 | ✗ No | ✗ No | — |
| Samsung Email | ? | ~ Partial | — |
| Thunderbird | ? | ? | — |
| ProtonMail | ✓ Yes | ✓ Yes | — |
| Fastmail | ? | ? | — |
Notes
- #1 Partial. `border-<inline/block>-color` and `border-<inline/block>-width` does not work.
Frequently Asked Questions
Related CSS Properties
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support border-inline & border-block individual logical properties.
Building a new email instead of checking an existing one? MailViewr's Email Builder only lets you use CSS that's known to render across clients, so border-inline & border-block individual logical properties can't sneak into your markup by accident. Open the Email Builder →