How many email clients support overflow?

It works in 4 of 21, partial in 16, not supported in Outlook Classic.

Does overflow work in Yahoo Mail iOS?

overflow is partly supported in Yahoo Mail iOS. Closest to Yahoo Mail Android: Yahoo Mail iOS, which agrees on 284 of the 297 features both are tested on.

overflow in Yahoo Mail Android

Partial overflow is partly supported in Yahoo Mail Android.

Buggy.

Works in 4 of 21 · partial in 16 · not supported in 1

Which clients

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

Your reader in Yahoo Mail Android may not see overflow the way you wrote it, even if it looks right where you tested it.

What to do instead in Yahoo Mail Android

Content will always be visible; design for full content display

instead

5 lines

<!-- Show full content, or truncate server-side -->
<div style="max-height: 200px;">
  Shortened content that fits...
  <a href="https://example.com/full">Read more</a>
</div>

Show the original

before

3 lines

<div style="max-height: 200px; overflow: hidden;">
  Long content that gets clipped...
</div>

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What Yahoo Mail Android does with overflow

caniemail record, tested upstream 27 May 2025

Buggy. Cannot scroll through to hidden content.
Partial. overflow-block & overflow-inline not supported.

Your next question

Every feature in Yahoo Mail Android · overflow in every client

Questions

How many email clients support overflow?: It works in 4 of 21, partial in 16, not supported in Outlook Classic.
What do I use instead of overflow in Yahoo Mail Android?: Content will always be visible; design for full content display.
Does overflow work in Yahoo Mail iOS?: overflow is partly supported in Yahoo Mail iOS. Closest to Yahoo Mail Android: Yahoo Mail iOS, which agrees on 284 of the 297 features both are tested on.

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

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Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 27 May 2025 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping