Email Clients

Previewing Yahoo Mail with Emailens

How Emailens previews Yahoo Mail across web and mobile, and how to interpret its preview output.

Looking for the full per-feature CSS support data rather than how the preview works? See the Full CSS support reference on emailens.dev.

Overview

ID	Category	Engine	Dark mode
`yahoo-mail`	Webmail	Yahoo	Yes

CSS support

Yahoo Mail has moderate CSS support, sitting between Gmail and Apple Mail:

<style> blocks , supported (unlike Gmail)
Flexbox and grid , supported
border-radius , partial support
box-shadow , supported
background-image , partial support
opacity , supported
position , partial support
box-sizing , unsupported
Inline font-family with a quoted name , dropped whole, fallbacks included; write font names unquoted

Key behaviors

Yahoo preserves <style> blocks, so class-based styling works
Media queries are supported, enabling responsive designs
Some CSS properties are prefixed or modified during processing

Recommendations

Yahoo Mail is generally well-behaved , focus testing on Gmail and Outlook first
Use <style> blocks for styling (they work here, unlike Gmail)
Use tables for layouts that must also hold in Outlook Classic

Previewing Apple Mail with Emailens

How Emailens renders Apple Mail on macOS and iOS, and what its WebKit engine means for your previews.

Previewing Samsung Mail with Emailens

How Emailens previews Samsung Mail and what its rendering quirks mean for your previews.

On this page

Overview CSS support Key behaviors Recommendations