How many email clients support transition?

It works in 4 of 21, partial in 7, not supported in 10.

Does transition work in Outlook (New)?

transition is not supported in Outlook (New). Closest to Outlook for Mac: Outlook (New), which agrees on 279 of the 299 features both are tested on.

transition in Outlook for Mac

Not supported transition is not supported in Outlook for Mac.

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 for Mac

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

instead

8 lines

.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

7 lines

.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 for Mac · 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 for Mac?: Transitions don't work in email; style the default state well.
Does transition work in Outlook (New)?: transition is not supported in Outlook (New). Closest to Outlook for Mac: Outlook (New), which agrees on 279 of the 299 features both are tested on.

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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