CSS3 animate border color - css

Question

I want to animate borders of an element using CSS3, whether it's in hover state or normal state. Can someone provide me a code snippet for this or can guide?
I can do this using jQuery but looking for some pure CSS3 solution.

Answer 1

You can use a CSS3 transition for this. Have a look at this example:
http://jsfiddle.net/ujDkf/1/
Here is the main code:
#box {
position : relative;
width : 100px;
height : 100px;
background-color : gray;
border : 5px solid black;
-webkit-transition : border 500ms ease-out;
-moz-transition : border 500ms ease-out;
-o-transition : border 500ms ease-out;
transition : border 500ms ease-out;
}
#box:hover {
border : 10px solid red;
}

Answer 2

You can try this also...
button {
background: none;
border: 0;
box-sizing: border-box;
margin: 1em;
padding: 1em 2em;
box-shadow: inset 0 0 0 2px #f45e61;
color: #f45e61;
font-size: inherit;
font-weight: 700;
vertical-align: middle;
position: relative;
}
button::before, button::after {
box-sizing: inherit;
content: '';
position: absolute;
width: 100%;
height: 100%;
}
.draw {
-webkit-transition: color 0.25s;
transition: color 0.25s;
}
.draw::before, .draw::after {
border: 2px solid transparent;
width: 0;
height: 0;
}
.draw::before {
top: 0;
left: 0;
}
.draw::after {
bottom: 0;
right: 0;
}
.draw:hover {
color: #60daaa;
}
.draw:hover::before, .draw:hover::after {
width: 100%;
height: 100%;
}
.draw:hover::before {
border-top-color: #60daaa;
border-right-color: #60daaa;
-webkit-transition: width 0.25s ease-out, height 0.25s ease-out 0.25s;
transition: width 0.25s ease-out, height 0.25s ease-out 0.25s;
}
.draw:hover::after {
border-bottom-color: #60daaa;
border-left-color: #60daaa;
-webkit-transition: border-color 0s ease-out 0.5s, width 0.25s ease-out 0.5s, height 0.25s ease-out 0.75s;
transition: border-color 0s ease-out 0.5s, width 0.25s ease-out 0.5s, height 0.25s ease-out 0.75s;
}
<section class="buttons">
<button class="draw">Draw</button>
</section>

Answer 3

If you need the transition to run infinitely, try the below example:
#box {
position: relative;
width: 100px;
height: 100px;
background-color: gray;
border: 5px solid black;
display: block;
}
#box:hover {
border-color: red;
animation-name: flash_border;
animation-duration: 2s;
animation-timing-function: linear;
animation-iteration-count: infinite;
-webkit-animation-name: flash_border;
-webkit-animation-duration: 2s;
-webkit-animation-timing-function: linear;
-webkit-animation-iteration-count: infinite;
-moz-animation-name: flash_border;
-moz-animation-duration: 2s;
-moz-animation-timing-function: linear;
-moz-animation-iteration-count: infinite;
}
#keyframes flash_border {
0% {
border-color: red;
}
50% {
border-color: black;
}
100% {
border-color: red;
}
}
#-webkit-keyframes flash_border {
0% {
border-color: red;
}
50% {
border-color: black;
}
100% {
border-color: red;
}
}
#-moz-keyframes flash_border {
0% {
border-color: red;
}
50% {
border-color: black;
}
100% {
border-color: red;
}
}
<div id="box">roll over me</div>

Answer 4

A bit late to this one but...
This is what I do:
.class {
color: tomato;
border: 10px solid currentColor;
transition: color 250ms linear;
// not part of solution just layout
width: 100px;
height: 100px;
display: flex;
justify-content: center;
align-items: center;
font-size: 2rem;
text-transform: uppercase;
}
.class:hover {
color: rebeccapurple;
}
<div class='class' >color way</div>