Outlook for Mac
CSS coverage profile for Outlook for Mac
Outlook for Mac renders with the WebKit engine and supports 233 of 298 tracked CSS and HTML features fully, with 16 partially supported and 48 unsupported. That places it in a broad coverage band.
Modern CSS works largely as expected. The cost of supporting this client is low. Most production templates need only minor adjustments.
233
Supported
16
Partial
48
Unsupported
298
Total
Breaks here, works nearly everywhere else
1 feature that Outlook for Mac drops while most other clients render it. This is usually what is behind an email that looks correct everywhere but here.
Renders here, dropped almost everywhere else
Safe in Outlook for Mac and almost nowhere else, so it needs a fallback the moment the send is not Outlook for Mac-only.
Where Outlook for Mac is weakest
- CSS Properties 37
- HTML Elements 8
- HTML Attributes 5
- Pseudo-Elements 5
- Pseudo-Classes & Selectors 4
Closest client: Superhuman
Superhuman agrees with Outlook for Mac on 82% of verified features. They still differ on 17: <link>, <video>, @import, @keyframes, accent-color, animation, and 11 more.
Side by side
HTML Elements48
| Feature | Support |
|---|---|
| <abbr> | Supported |
| <acronym> | Supported |
| <address> | Supported |
| <audio> | Unsupported |
| <base> | Partial |
| <bdi> | Supported |
| <blockquote> | Supported |
| <body> | Unsupported |
| <button type="reset"> | Supported |
| <button type="submit"> | Unsupported |
| <code> | Supported |
| <del> | Supported |
| <dfn> | Supported |
| <dialog> | Supported |
| <div> | Supported |
| <form> | Unsupported |
| <h1> | Supported |
| <hr> | Supported |
| <img> | Supported |
| <input type="checkbox"> | Supported |
| <input type="hidden"> | Supported |
| <input type="radio"> | Supported |
| <input type="reset"> | Supported |
| <input type="submit"> | Unsupported |
| <input type="text"> | Supported |
| <link> | Supported |
| <marquee> | Supported |
| <meter> | Supported |
| <object> | Partial |
| <p> | Supported |
| <picture> | Supported |
| <pre> | Supported |
| <progress> | Supported |
| <rp> | Supported |
| <rt> | Supported |
| <ruby> | Supported |
| <select> | Supported |
| <small> | Supported |
| <span> | Supported |
| <strike> | Supported |
| <strong> | Supported |
| <style> | Supported |
| <svg> | Supported |
| <table> | Supported |
| <textarea> | Supported |
| <ul> | Partial |
| <video> | Supported |
| <wbr> | Supported |
HTML Attributes22
| Feature | Support |
|---|---|
| [align] | Partial |
| [aria-describedby] | Supported |
| [aria-hidden] | Supported |
| [aria-label] | Supported |
| [aria-labelledby] | Supported |
| [aria-live] | Supported |
| [background] | Supported |
| [cellpadding] | Supported |
| [cellspacing] | Supported |
| [command] | Unsupported |
| [dir] | Supported |
| [height] | Supported |
| [hidden] | Unsupported |
| [lang] | Supported |
| [loading] | Supported |
| [popover] | Unsupported |
| [required] | Supported |
| [role] | Supported |
| [srcset] | Supported |
| [target] | Partial |
| [valign] | Supported |
| [width] | Supported |
HTML & Email Structure8
| Feature | Support |
|---|---|
| amp4email | Unsupported |
| anchor-links | Supported |
| doctype | Supported |
| html-comments | Supported |
| html5-semantics | Supported |
| image-maps | Supported |
| mailto-links | Supported |
| meta-color-scheme | Unsupported |
CSS At-Rules10
| Feature | Support |
|---|---|
| @font-face | Supported |
| @import | Supported |
| @keyframes | Supported |
| @media | Supported |
| @media device-pixel-ratio | Supported |
| @media hover | Supported |
| @media orientation | Supported |
| @media prefers-color-scheme | Supported |
| @media prefers-reduced-motion | Supported |
| @supports | Supported |
Pseudo-Elements6
| Feature | Support |
|---|---|
| ::after | Partial |
| ::before | Partial |
| ::first-letter | Partial |
| ::first-line | Partial |
| ::marker | Supported |
| ::placeholder | Partial |
Pseudo-Classes & Selectors34
| Feature | Support |
|---|---|
| :adjacent-sibling | Supported |
| :attribute-selector | Supported |
| :chaining | Supported |
| :checked | Supported |
| :child-combinator | Supported |
| :class-selector | Supported |
| :descendant-combinator | Supported |
| :first-child | Supported |
| :first-of-type | Supported |
| :focus | Supported |
| :focus-visible | Partial |
| :focus-within | Partial |
| :general-sibling | Supported |
| :grouping | Supported |
| :has | Unsupported |
| :hover | Supported |
| :id-selector | Supported |
| :lang | Unsupported |
| :last-child | Supported |
| :last-of-type | Supported |
| :link | Supported |
| :not | Supported |
| :nth-child | Supported |
| :nth-last-child | Supported |
| :nth-of-type | Supported |
| :only-child | Supported |
| :only-of-type | Supported |
| :target | Supported |
| :type-selector | Supported |
| :universal-selector | Supported |
| :visited | Supported |
| pseudo-class-active | Supported |
| pseudo-class-default | Supported |
| pseudo-class-nth-last-of-type | Supported |
CSS Functions8
| Feature | Support |
|---|---|
| calc | Supported |
| clamp | Unsupported |
| conic-gradient | Supported |
| fit-content | Supported |
| linear-gradient | Unsupported |
| max | Supported |
| min | Supported |
| radial-gradient | Unsupported |
CSS Properties162
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Support data last updated Sep 2, 2026 - synced from caniemail.com (MIT) via @emailens/engine.