How many email clients support transition?

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

Does transition work in Apple Mail?

transition works in Apple Mail. Closest to Thunderbird: Apple Mail, which agrees on 219 of the 261 features both are tested on.

transition in Thunderbird

Works transition works in Thunderbird.

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

The fix for the clients that need it

Needed in 17 of 21: Gmail, Gmail Android, Gmail iOS and 14 more.

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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Every feature in Thunderbird · transition in every client

Questions

How many email clients support transition?: It works in 4 of 21, partial in 7, not supported in 10.
Does transition work in Apple Mail?: transition works in Apple Mail. Closest to Thunderbird: Apple Mail, which agrees on 219 of the 261 features both are tested on.

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