My background-image transition is working fine in Chrome, but does nothing in Firefox. I am new to CSS3 transitions. Did research and my syntax seems to be correct. From what I have read FF should support this. I am on FF 12.0. How come this CSS3 transition does not work in Firefox.
No javascript. No workarounds. Just an explanation of why this is failing would be wonderful.
a.call_to_action
{
text-decoration: none;
display: block;
color: #232744;
font-size: 20px;
font-weight: bold;
height: 47px;
width: 185px;
overflow: hidden;
margin: 10px auto 15px auto;
text-align: center;
border: none;
background: yellow;
background-image: url(http://www.pslover.com/images/thumb/2751.jpg);
-webkit-transition: background-image .5s linear;
-moz-transition: background-image .5s linear;
}
a.call_to_action:hover {
background: orange;
background-image: url(http://www.tutorialdash.com/avatars/3b1f70c20325d8676ce1f56cb9b43f17.gif);
color: #4F4246;
}
Found the answer in the MDN docs.
http://oli.jp/2010/css-animatable-properties/#background-image
background-image
This is still a little up in the air, with “only gradients” in the current Working Draft, no background-image at all in the current Editor’s Draft, and “Animatable: no” for background-image in CSS Backgrounds and Borders Module Level 3 Editor’s Draft. However, support has appeared in Chrome 19 Canary, and this is something that designers want. Until widespread support arrives this can be faked via image sprites and background-position or opacity.'
At this time I have found that nobody actually supports gradients (Chrome 17, FF 12, IE9). Only Chrome supports background-image (that's why it doesn't work in FF for me).
It is 2014 and background-image property is still not animatable: http://dev.w3.org/csswg/css-backgrounds/#background-image
Works fine in webkit but not in Firefox. It seems that the only way to make some animation is to use jQuery fallback for Firefox.
来源：https://stackoverflow.com/questions/10354742/css3-transition-of-background-image-for-firefox-not-working