HTML Elements

<link>

HTML element · 5 supported, 0 partial, 16 unsupported across 21 clients

As of Sep 2, 2026, <link> fails or degrades in 16 of 21 email clients, treat it as progressive enhancement, never structure.

0/7 webmail, 4/6 desktop, 1/8 mobile clients support <link> fully.
Unsupported in Gmail, Gmail Android, Gmail iOS, Outlook 365 and 12 more.
Documented before/after fixes on this page cover 21 clients, including Gmail and Gmail Android.
Across all clients, only 6 of 298 tracked HTML/CSS features render identically everywhere.

Source: caniemail.com (MIT), via the Emailens engine. Last tested upstream Dec 21, 2023, synced by Emailens Sep 2, 2026.

Client Support

Client	Category	Engine	Support
Gmail	webmail	Gmail Web	Unsupported
Gmail Android	mobile	Gmail Mobile	Unsupported
Gmail iOS	mobile	Gmail Mobile	Unsupported
Outlook 365	webmail	Outlook Web	Unsupported
Outlook (New)	desktop	Outlook Web	Supported
Outlook Classic	desktop	Microsoft Word	Supported
Outlook iOS	mobile	Outlook Mobile	Unsupported
Outlook Android	mobile	Outlook Mobile	Unsupported
Outlook for Mac	desktop	WebKit	Supported
Apple Mail	desktop	WebKit	Supported
Apple Mail iOS	mobile	WebKit	Supported
Yahoo Mail	webmail	Yahoo	Unsupported
Yahoo Mail Android	mobile	Yahoo	Unsupported
Yahoo Mail iOS	mobile	Yahoo	Unsupported
Samsung Mail	mobile	Samsung	Unsupported
Thunderbird	desktop	Gecko	Unsupported
HEY Mail	webmail	WebKit	Unsupported
Proton Mail	webmail	Proton	Unsupported
AOL Mail	webmail	AOL	Unsupported
Fastmail	webmail	Fastmail	Unsupported
Superhuman	desktop	Blink	Unsupported

Client-by-client behaviour for <link>

Fully supports <link> (5): Outlook (New), Outlook Classic, Outlook for Mac, Apple Mail, Apple Mail iOS.

No support (16): Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook iOS, Outlook Android, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman. Plan fallbacks for these clients before relying on <link> in production sends.

Fixes & Workarounds

Gmail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Gmail Android

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Gmail iOS

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Outlook 365

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Outlook iOS

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Outlook Android

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Yahoo Mail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Yahoo Mail Android

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Yahoo Mail iOS

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Samsung Mail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Thunderbird

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

HEY Mail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Proton Mail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

AOL Mail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Fastmail

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Superhuman

Unsupported

Inline all CSS directly in the HTML.

Before (Broken)

before.html

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

After (Fixed)

fixed.html

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Inline all CSS instead of using external stylesheets

Production guidance for <link>

When in doubt, ship a baseline that renders without <link> and treat it as progressive enhancement on clients where support is verified. Emailens automatically detects cross-client divergence on this feature when you preview an email, so you can see exactly which template paths break before a campaign goes out.

Related Features

Check your own HTML for <link>

Paste your own, or run the sample below. Analyzed in this page, with no signup and nothing stored.

Zero-Friction Engine Preview

Test your <link> layout across 21 email clients

Preview rendering, catch CSS issues, and see how <link> displays across Outlook, Gmail, and Apple Mail. Free, no account needed.

Instant live preview · No signup required · 21 email engines

Last tested upstream: Dec 21, 2023 · Last synced by Emailens: Sep 2, 2026

caniemail.com (MIT) records Dec 21, 2023 as the last time <link> was tested in a real client, 2 years before this sync. Syncing copies that result forward, it does not re-test it. Carried in @emailens/engine data v0.12.2.