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opacity in AOL Mail

Not supported opacity is not supported in AOL Mail.

Works in 19 of 21 · not supported in 2

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

Your reader in AOL Mail sees the email without opacity, even if it looks right where you tested it.

The fix for AOL Mail

Replace opacity with solid color equivalents

after 
.overlay {
  /* Use a semi-transparent color instead of opacity */
  background-color: #808080;
  /* Or for modern clients: rgba(0, 0, 0, 0.5) */
}
Show the original
before 
.overlay {
  background-color: #000;
  opacity: 0.5;
}

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What AOL Mail does with opacity

@emailens/engine 0.18.22 on the original code

AOL Mail does not support "opacity".

Your next question

Every feature in AOL Mail · opacity in every client

Questions

How many email clients support opacity?
It works in 19 of 21, not supported in Outlook Classic and AOL Mail.
What do I use instead of opacity in AOL Mail?
Replace opacity with solid color equivalents.
Does opacity work in Yahoo Mail Android?
opacity works 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.

The checker needs a computer screen.

caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Feb 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping