How many email clients support transition?

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

Does transition work in Yahoo Mail Android?

transition is partly supported in Yahoo Mail Android. Closest to AOL Mail: Yahoo Mail Android, which agrees on 281 of the 297 features both are tested on.

transition in AOL Mail

Partial transition is partly supported in AOL Mail.

Longhand properties are not supported.

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 AOL Mail

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;
}

A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →

What AOL Mail does with transition

caniemail record, tested upstream 29 Mar 2024

Partial. Longhand properties are not supported.
Buggy. The all keyword is not supported.

Your next question

Every feature in AOL Mail · 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 AOL Mail?: Transitions don't work in email; style the default state well.
Does transition work in Yahoo Mail Android?: transition is partly supported in Yahoo Mail Android. Closest to AOL Mail: Yahoo Mail Android, which agrees on 281 of the 297 features both are tested on.

To see what else in your email AOL Mail does not support, paste the whole email.

Check your email, free

No signup · Five clients free, Outlook Classic included · All 21 with an account

The checker needs a computer screen.

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