CSS Properties

word-break

CSS property · 6 supported, 10 partial, 5 unsupported across 21 clients

Client Support

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

Client-by-client behaviour for word-break

Fully supports word-break (6): Gmail, Outlook (New), Thunderbird, Proton Mail, Fastmail, Superhuman.

Partial support (10): Gmail Android, Gmail iOS, Outlook 365, Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Samsung Mail, HEY Mail. Expect rendering quirks unique to each engine. Partial support typically means a subset of values, an ignored shorthand, or sanitizer-specific rewrites.

No support (5): Outlook Classic, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail. Plan fallbacks for these clients before relying on word-break in production sends.

Fixes & Workarounds

Outlook Classic

Unsupported

Outlook's Word engine ignores word-break. Place text inside a <td> with a constrained width — tables always wrap.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Yahoo Mail

Unsupported

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Yahoo Mail Android

Unsupported

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Yahoo Mail iOS

Unsupported

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

AOL Mail

Unsupported

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Gmail Android

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Gmail iOS

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Outlook 365

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Outlook iOS

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Outlook Android

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Outlook for Mac

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Apple Mail

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Apple Mail iOS

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Samsung Mail

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

HEY Mail

Partial

Wrap long text in a <table><td> to force wrapping in clients that don't support word-break.

Before

<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

After

<!-- Table cells force text wrapping in all clients including Outlook -->
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="word-break: break-all; overflow-wrap: break-word;
               word-wrap: break-word;">
      https://example.com/very/long/url?token=abc123def456
    </td>
  </tr>
</table>

Wrap long text in a table cell to force line breaks without word-break

Production guidance for word-break

word-break is a CSS property. Across the email client matrix, 6 of 15 tracked clients support it fully, 10 only partially, and 5 not at all. The clients most likely to require a workaround for this feature are Outlook Classic, Yahoo Mail, Yahoo Mail Android. Each of them needs a tailored fallback. See the per-client examples above for the specific code fix Emailens recommends.

When in doubt, ship a baseline that renders without word-break 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

!important accent-color align-items animation aspect-ratio backdrop-filter background background-blend-mode

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Support data last updated Apr 27, 2026 · synced from caniemail.com via @emailens/engine.