Is border-image-width supported?

by David Storey

HTML

<div class="url number-1"></div>
<div class="url number-2"></div>
<div class="url number-3"></div>
<div class="url number-4"></div>
<div class="url length-1"></div>
<div class="url length-2"></div>
<div class="url length-3"></div>
<div class="url length-4"></div>
<div class="url percent-1"></div>
<div class="url percent-2"></div>
<div class="url percent-3"></div>
<div class="url percent-4"></div>
<div class="url auto"></div>

<div class="url mixed-2"></div>
<div class="url mixed-3"></div>
<div class="url mixed-4"></div>

CSS

div {
    width: 200px;
    height: 200px;
    border: 20px solid red;
    margin: .5em;
    
    border-image-slice: 20;
    border-image-source: url("https://dl.dropboxusercontent.com/u/444684/openwebref/images/placeholder.png");
}

.number-1 {
    border-image-width: 20;
}
.number-2 {
    border-image-width: 20 40;
}
.number-3 {
    border-image-width: 20 30 40;
}
.number-4 {
    border-image-width: 10 20 30 40;
}
.length-1 {
    border-image-width: 20px;
}
.length-2 {
    border-image-width: 20px 40px;
}
.length-3 {
    border-image-width: 20px 30px 40px;
}
.length-4 {
    border-image-width: 10px 20px 30px 40px;
}
.percent-1 {
    border-image-width: 5%;
}
.percent-2 {
    border-image-width: 5% 10%;
}
.percent-3 {
    border-image-width: 5% 10% 15%;
}
.percent-4 {
    border-image-width: 5% 10% 15% 20%;
}
.auto{
    border-image-width: auto;
}
.mixed-2 {
    border-image-width: 5% 10px;
}
.mixed-3 {
    border-image-width: 5px 10 15%;
}
.mixed-4 {
    border-image-width: 5 10% 15px auto;
}