Making a CSS3 animation more reliable among browsers - html

Question

I have this CSS3 animation working on codepen.
HTML
<div class="heart heart1"></div>
<div class="heart heart2"></div>
CSS3
html, body{
width: 100%;
height: 100%;
min-width: 500px;
min-height: 500px;
overflow: hidden;
}
.heart {
position: absolute;
width: 100px;
height: 90px;
top: 50%;
left: 50%;
margin-top: -45px;
margin-left: -50px;
}
.heart:before,
.heart:after {
position: absolute;
content: "";
left: 50px;
top: 0;
width: 50px;
height: 80px;
background: #fc2e5a;
border-radius: 50px 50px 0 0;
transform: rotate(-45deg);
transform-origin: 0 100%;
}
.heart:after {
left: 0;
transform: rotate(45deg);
transform-origin :100% 100%;
}
.heart1{
animation: heart-anim 1s linear .4s infinite;
}
.heart2{
animation: pounding .5s linear infinite alternate;
}
.heart1:after, .heart1:before{
background-color: #ff7693;
}
#keyframes pounding{
0%{ transform: scale(1.5); }
100%{ transform: scale(1); }
}
#keyframes heart-anim {
46% {
transform: scale(1);
}
50% {
transform: scale(1.3);
}
52% {
transform: scale(1.5);
}
55% {
transform: scale(3);
}
100% {
opacity: 0;
transform: scale(50);
}
}
Check it here: http://codepen.io/RadValentin/pen/sfnCE
As you can see is working ok, BUT, if I post the exact code to my local server OR to jsfiddle it does not work any more: http://jsfiddle.net/40aydbfr/
I believe the animation is not made according to the best practices since it breaks very easily.
So, Why it does not work outside of codepen and how can I make it more cross browser compatible.
PS: Im using Chrome.

Answer 1

It doesn't work because you are missing vendor prefixes for -webkit- browsers.
The reason why it works on codepen is because, if you click on the settings button above the CSS window, you'll see that -prefix-free is enabled, which means it adds the prefixes automatically.
Always check browser support, if something doesn't work.
Updated Codepen
Updated Fiddle
html,
body {
width: 100%;
height: 100%;
min-width: 500px;
min-height: 500px;
overflow: hidden;
}
.heart {
position: absolute;
width: 100px;
height: 90px;
top: 50%;
left: 50%;
margin-top: -45px;
margin-left: -50px;
}
.heart:before,
.heart:after {
position: absolute;
content: "";
left: 50px;
top: 0;
width: 50px;
height: 80px;
background: #fc2e5a;
border-radius: 50px 50px 0 0;
transform: rotate(-45deg);
transform-origin: 0 100%;
}
.heart:after {
left: 0;
transform: rotate(45deg);
transform-origin: 100% 100%;
}
.heart1 {
-webkit-animation: heart-anim 1s linear .4s infinite;
animation: heart-anim 1s linear .4s infinite;
}
.heart2 {
-webkit-animation: pounding .5s linear infinite alternate;
animation: pounding .5s linear infinite alternate;
}
.heart1:after,
.heart1:before {
background-color: #ff7693;
}
#-webkit-keyframes pounding {
0% {
transform: scale(1.5);
}
100% {
transform: scale(1);
}
}
#keyframes pounding {
0% {
transform: scale(1.5);
}
100% {
transform: scale(1);
}
}
#-webkit-keyframes heart-anim {
46% {
transform: scale(1);
}
50% {
transform: scale(1.3);
}
52% {
transform: scale(1.5);
}
55% {
transform: scale(3);
}
100% {
opacity: 0;
transform: scale(50);
}
}
#keyframes heart-anim {
46% {
transform: scale(1);
}
50% {
transform: scale(1.3);
}
52% {
transform: scale(1.5);
}
55% {
transform: scale(3);
}
100% {
opacity: 0;
transform: scale(50);
}
}
<div class="heart heart1"></div>
<div class="heart heart2"></div>