CSS mask-image with linear gradient not working in Edge - css

Question

Caniuse.com says that Edge has full support for mask-image but the following code is working in all browsers for me except Edge.
width: 200px;
height: 200px;
background: red;
mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
This should produce a simple red box which is red a the top and transparent at the bottom. Tested in Chrome and Firefox with no problems.
So, is it just incompatible with linear-gradient? I have scoured the web but can't find an answer.

Answer 1

Here is my testing code.
#masked {
width: 200px;
height: 200px;
background: red;
mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
-webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
}
<div id="masked"></div>
I've found that if I do not add -webkit-mask-image, when running on Chrome, there will be no transparent at the bottom.
But it always works well on Edge.
My version is Microsoft Edge 44.17763.1.0,Microsoft EdgeHTML 18.17763.

Answer 2

According to Can I Use, mask-image is supported in Edge 18, but is hidden behind a flag in lower versions.

Answer 3

Couple additional things:
If you're doing this on a picture element you need to add it on the img and not the containing picture.
Even in 2022 you still need -webkit-mask-image. Preprocessors should add this though.
If you have been using custom properties such as --theme-color: red make sure you only add a single dash for -webkit and not the double dash my stupid brain automatically entered for me today.