Use CSS3 transitions with gradient backgrounds

Question

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

Answer 1

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;
}