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transition in Outlook iOS

Not supported transition is not supported in Outlook iOS.

Works in 4 of 21 · partial in 7 · not supported in 10

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

What to do instead in Outlook iOS

Transitions don't work in email; style the default state well

instead
.button {
  /* Use the most visually appealing state as default.
     :hover is only supported in a few clients. */
  background-color: #6d28d9;
  color: #ffffff;
  text-decoration: none;
  font-weight: bold;
}
Show the original
before
.button {
  background-color: #6d28d9;
  transition: background-color 0.2s;
}
.button:hover {
  background-color: #5b21b6;
}

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Your next question

Every feature in Outlook iOS · transition in every client

Questions

How many email clients support transition?
It works in 4 of 21, partial in 7, not supported in 10.
What do I use instead of transition in Outlook iOS?
Transitions don't work in email; style the default state well.
Does transition work in Outlook Android?
transition is not supported in Outlook Android. Closest to Outlook iOS: Outlook Android, which agrees on 270 of the 296 features both are tested on.

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

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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 29 Mar 2024 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping