visibility in Proton Mail
Works visibility works in Proton Mail.
Works in 13 of 21 · not supported in 8
Which clients
- Works
- Outlook 365, Outlook (New), Outlook iOS, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Fastmail, Superhuman
- Not supported
- Gmail, Gmail Android, Gmail iOS, Outlook Classic, Outlook Android, Yahoo Mail, Yahoo Mail Android, AOL Mail
The fix for the clients that need it
Needed in 8 of 21: Gmail, Gmail Android, Gmail iOS and 5 more.
Use conditional comments or remove hidden content
<!-- For screen readers, use font-size: 0 trick -->
<div style="font-size: 0; max-height: 0; overflow: hidden;
mso-hide: all;" aria-hidden="true">
Preheader text
</div>Show the original
<div style="visibility: hidden;">
Hidden content for screen readers
</div>A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →
What Proton Mail does with visibility
caniemail record, tested upstream 28 Feb 2019
- Buggy.
visibility:collapseapplied to a<tr>only hides content and does not "remove" it from layout.
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 visibility?
- It works in 13 of 21, not supported in 8.
- Does visibility work in Apple Mail?
- visibility works in Apple Mail. Closest to Proton Mail: Apple Mail, which agrees on 203 of the 300 features both are tested on.
To see what 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
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Real captures 14 Oct 2026 on 11 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Feb 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping