overflow in Proton Mail
Partial overflow is partly supported in Proton Mail.
Support for overflow-block & overflow-inline depends on browser support.
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 Proton Mail may not see overflow the way you wrote it, even if it looks right where you tested it.
What to do instead in Proton Mail
Content will always be visible; design for full content display
<!-- 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
<div style="max-height: 200px; overflow: hidden;">
Long content that gets clipped...
</div>A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →
What Proton Mail does with overflow
caniemail record, tested upstream 27 May 2025
- Partial. Support for
overflow-block&overflow-inlinedepends on browser support. - Buggy. Cannot scroll through to hidden content.
Your next question
- Does animation work in Proton Mail?
Works in 5 of 21 · partial in 1 · not supported in 15
fix - Does text-decoration work in Proton Mail?
Works in 14 of 21 · partial in 6 · not supported in 1
- Does min-height work in Proton Mail?
Works in 19 of 21 · not supported in 2
advice - Does list-style work in Proton Mail?
Works in 11 of 21 · partial in 9 · not supported in 1
- Does bimi work in Proton Mail?
Works in 9 of 21 · not supported in 11 · 1 untested
- Does list-style-image work in Proton Mail?
Works in 6 of 21 · not supported in 14 · 1 untested
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 Proton Mail?
- Content will always be visible; design for full content display.
- Does overflow work in Apple Mail?
- overflow is partly supported in Apple Mail. Closest to Proton Mail: Apple Mail, which agrees on 203 of the 300 features both are tested on.
To see what else in your email Proton Mail does not support, paste the whole email.
No signup · Five clients free, Outlook Classic included · All 21 with an account
The checker needs a computer screen.
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