border-spacing in Superhuman
Works border-spacing works in Superhuman.
Works in 17 of 21 · not supported in 2 · 2 untested
Which clients
- Works
- Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, Proton Mail, AOL Mail, Superhuman
- Not supported
- Outlook Classic, Outlook for Mac
- Untested
- HEY Mail, Fastmail
The fix for the clients that need it
Needed in 2 of 21: Outlook Classic and Outlook for Mac.
Use the cellspacing HTML attribute instead of border-spacing CSS
<table cellspacing="8" style="border-collapse: separate;">
<tr><td>Cell</td></tr>
</table>Show the original
<table style="border-spacing: 8px; border-collapse: separate;">
<tr><td>Cell</td></tr>
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Your next question
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Works in 1 of 21 · partial in 1 · not supported in 16 · 3 untested
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Works in 10 of 21 · partial in 4 · not supported in 7
fix - Does <link> work in Superhuman?
Works in 3 of 21 · not supported in 18
fix - Does <video> work in Superhuman?
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fix - Does @import work in Superhuman?
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- Does <audio> work in Superhuman?
Works in 4 of 21 · not supported in 17
Every feature in Superhuman · border-spacing in every client
Questions
- How many email clients support border-spacing?
- It works in 17 of 21, not supported in Outlook Classic and Outlook for Mac, 2 untested.
To see what in your email Superhuman 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 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 20 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping