Yahoo Mail iOS
CSS coverage profile for Yahoo Mail iOS
Yahoo Mail iOS renders with the Yahoo engine and supports 120 of 298 tracked CSS and HTML features fully, with 28 partially supported and 148 unsupported. That places it in a moderate coverage band.
A meaningful portion of CSS is unsupported or partially supported. Plan fallbacks for layout-critical features and validate every template before send.
120
Supported
28
Partial
148
Unsupported
298
Total
Breaks here, works nearly everywhere else
8 features that Yahoo Mail iOS drops while most other clients render them. This is usually what is behind an email that looks correct everywhere but here.
Renders here, dropped almost everywhere else
Safe in Yahoo Mail iOS and almost nowhere else, so it needs a fallback the moment the send is not Yahoo Mail iOS-only.
Where Yahoo Mail iOS is weakest
- CSS Properties 112
- HTML Elements 20
- HTML Attributes 14
- CSS At-Rules 9
- CSS Functions 8
Closest client: Yahoo Mail
Yahoo Mail agrees with Yahoo Mail iOS on 96% of verified features. They still differ on 13: <body>, <button type="submit">, <form>, <input type="submit">, <marquee>, <select>, and 7 more.
HTML Elements48
| Feature | Support |
|---|---|
| <abbr> | Unsupported |
| <acronym> | Unsupported |
| <address> | Supported |
| <audio> | Unsupported |
| <base> | Partial |
| <bdi> | Unsupported |
| <blockquote> | Supported |
| <body> | Unsupported |
| <button type="reset"> | Unsupported |
| <button type="submit"> | Unsupported |
| <code> | Supported |
| <del> | Supported |
| <dfn> | Supported |
| <dialog> | Unsupported |
| <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> | Unsupported |
| <marquee> | Supported |
| <meter> | Unsupported |
| <object> | Unsupported |
| <p> | Supported |
| <picture> | Unsupported |
| <pre> | Supported |
| <progress> | Unsupported |
| <rp> | Supported |
| <rt> | Supported |
| <ruby> | Supported |
| <select> | Unsupported |
| <small> | Supported |
| <span> | Supported |
| <strike> | Supported |
| <strong> | Supported |
| <style> | Supported |
| <svg> | Unsupported |
| <table> | Supported |
| <textarea> | Supported |
| <ul> | Partial |
| <video> | Unsupported |
| <wbr> | Supported |
HTML Attributes22
| Feature | Support |
|---|---|
| [align] | Supported |
| [aria-describedby] | Unsupported |
| [aria-hidden] | Unsupported |
| [aria-label] | Unsupported |
| [aria-labelledby] | Unsupported |
| [aria-live] | Unsupported |
| [background] | Supported |
| [cellpadding] | Supported |
| [cellspacing] | Supported |
| [command] | Unsupported |
| [dir] | Supported |
| [height] | Supported |
| [hidden] | Unsupported |
| [lang] | Partial |
| [loading] | Unsupported |
| [popover] | Unsupported |
| [required] | Unsupported |
| [role] | Partial |
| [srcset] | Unsupported |
| [target] | Unsupported |
| [valign] | Supported |
| [width] | Supported |
HTML & Email Structure8
| Feature | Support |
|---|---|
| amp4email | Supported |
| anchor-links | Unsupported |
| doctype | Supported |
| html-comments | Supported |
| html5-semantics | Unsupported |
| image-maps | Supported |
| mailto-links | Supported |
| meta-color-scheme | Unsupported |
CSS At-Rules10
| Feature | Support |
|---|---|
| @font-face | Unsupported |
| @import | Unsupported |
| @keyframes | Unsupported |
| @media | Partial |
| @media device-pixel-ratio | Unsupported |
| @media hover | Unsupported |
| @media orientation | Unsupported |
| @media prefers-color-scheme | Unsupported |
| @media prefers-reduced-motion | Unsupported |
| @supports | Supported |
Pseudo-Elements6
| Feature | Support |
|---|---|
| ::after | Unsupported |
| ::before | Unsupported |
| ::first-letter | Supported |
| ::first-line | Supported |
| ::marker | Supported |
| ::placeholder | Supported |
Pseudo-Classes & Selectors34
| Feature | Support |
|---|---|
| :adjacent-sibling | Supported |
| :attribute-selector | Partial |
| :chaining | Supported |
| :checked | Supported |
| :child-combinator | Supported |
| :class-selector | Supported |
| :descendant-combinator | Supported |
| :first-child | Supported |
| :first-of-type | Supported |
| :focus | Supported |
| :focus-visible | Unknown |
| :focus-within | Unknown |
| :general-sibling | Supported |
| :grouping | Supported |
| :has | Unsupported |
| :hover | Supported |
| :id-selector | Supported |
| :lang | Unsupported |
| :last-child | Supported |
| :last-of-type | Supported |
| :link | Supported |
| :not | Unsupported |
| :nth-child | Unsupported |
| :nth-last-child | Unsupported |
| :nth-of-type | Unsupported |
| :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 | Unsupported |
CSS Functions8
| Feature | Support |
|---|---|
| calc | Unsupported |
| clamp | Unsupported |
| conic-gradient | Unsupported |
| fit-content | Unsupported |
| linear-gradient | Unsupported |
| max | Unsupported |
| min | Unsupported |
| radial-gradient | Unsupported |
CSS Properties162
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Support data last updated Sep 2, 2026 - synced from caniemail.com (MIT) via @emailens/engine.