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word-break in Yahoo Mail iOS

Not supported word-break is not supported in Yahoo Mail iOS.

Works in 4 of 21 · partial in 12 · not supported in 5

Which clients
Works
Gmail, Thunderbird, Fastmail, Superhuman
Partial
Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Samsung Mail, HEY Mail, Proton Mail
Not supported
Outlook Classic, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail

Your reader in Yahoo Mail iOS sees the email without word-break, even if it looks right where you tested it.

The fix for Yahoo Mail iOS

Outlook Windows does not wrap a URL on word-break, word-wrap, or overflow-wrap. Insert ​ in a cell that has a width

after
<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td width="100%">
      https://example.com/&#8203;very/&#8203;long/&#8203;url?token=&#8203;abc123def456
    </td>
  </tr>
</table>
Show the original
before
<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

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What Yahoo Mail iOS does with word-break

@emailens/engine 0.18.22 on the original code

Yahoo Mail iOS does not support "word-break".

Your next question

Every feature in Yahoo Mail iOS · word-break in every client

Questions

How many email clients support word-break?
It works in 4 of 21, partial in 12, not supported in 5.
What do I use instead of word-break in Yahoo Mail iOS?
Outlook Windows does not wrap a URL on word-break, word-wrap, or overflow-wrap. Insert &#8203; in a cell that has a width.
Does word-break work in Yahoo Mail Android?
word-break is not supported in Yahoo Mail Android. Closest to Yahoo Mail iOS: Yahoo Mail Android, which agrees on 284 of the 297 features both are tested on.

To see what else in your email Yahoo Mail iOS does not support, paste the whole email.

The checker needs a computer screen.

Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 15 Feb 2022 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping