Use CSS3 transitions with gradient backgrounds

314

I'm trying to transition on hover with CSS over a thumbnail so that on hover, the background gradient fades in. The transition isn't working, but if I simply change it to an rgba() value, it works fine.

Are gradients not supported? I tried using an image too, it won't transition the image either.

I know it's possible, as in another post someone did it, but I can't figure out how exactly. Any help? Here's some CSS to work with:

#container div a {
  -webkit-transition: background 0.2s linear;
  -moz-transition: background 0.2s linear;
  -o-transition: background 0.2s linear;
  transition: background 0.2s linear;
  position: absolute;
  width: 200px;
  height: 150px;
  border: 1px #000 solid;
  margin: 30px;
  z-index: 2
}

#container div a:hover {
  background: -webkit-gradient(radial, 100 75, 100, 100 75, 0, from(rgba(0, 0, 0, .7)), to(rgba(0, 0, 0, .4)))
}

css css-transitions css-gradients

Edit Report

A solution is to use background-position to mimic the gradient transition. This solution was used in Twitter Bootstrap a few months ago.

Update

http://codersblock.blogspot.fr/2013/12/gradient-animation-trick.html?showComment=1390287622614

Here is a quick example:

Link state

 .btn {
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 12px;
  font-weight: 300;
  position: relative;
  display: inline-block;
  text-decoration: none;
  color: #fff;
  padding: 20px 40px;
  background-image: -moz-linear-gradient(top, #50abdf, #1f78aa);
  background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#50abdf), to(#1f78aa));
  background-image: -webkit-linear-gradient(top, #50abdf, #1f78aa);
  background-image: -o-linear-gradient(top, #50abdf, #1f78aa);
  background-image: linear-gradient(to bottom, #50abdf, #1f78aa);
  background-repeat: repeat-x;
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff50abdf', endColorstr='#ff1f78aa', GradientType=0);
  background-repeat: repeat-y;
  background-size: 100% 90px;
  background-position: 0 -30px;
  -webkit-transition: all 0.2s linear;
     -moz-transition: all 0.2s linear;
       -o-transition: all 0.2s linear;
          transition: all 0.2s linear;
}

Hover state

.btn:hover {
   background-position: 0 0;
}

answered 2013-03-19T12:20:50.847

Use CSS3 transitions with gradient backgrounds

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