mask-border-outset
The mask-border-outset CSS property specify the amount by which the mask border image area extends beyond the border box.
CSS
mask-border-outset: value;
JS
object.style.maskBorderOutset = "value";
Values
<'mask-border-outset'> = [ <length> | <number> ]{1,4}
<length>
Specifies the length using a number followed by a unit of measurement.
<number>
An integer or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits. The first character may be preceded by a sign (- or +). The last character may be succeeded by an exponent (e or E) and an integer.
Initial
length
number
<!doctype html>
<html>
<head>
<style>
div {
border-color: yellow;
border-style: solid;
border-width: 20px;
margin: 40px;
mask-border-outset: 2;
mask-border-slice: 33.33%;
mask-border-source: url(/assets/png/9Slice.png);
}
</style>
</head>
<body>
<div>number</div>
</body>
</html>
JS
<!doctype html>
<html>
<head>
<style>
div {
border-color: yellow;
border-style: solid;
border-width: 20px;
margin: 40px;
mask-border-slice: 33.33%;
mask-border-source: url(/assets/png/9Slice.png);
}
</style>
<script>
function mouseover(value) {
document.getElementsByTagName("div")[0].style.maskBorderOutset = value;
}
</script>
</head>
<body>
<input onmouseover="mouseover(value)" type="button" value="initial">
<button onmouseover="mouseover(value)" value="40px">length</button>
<button onmouseover="mouseover(value)" value="2">number</button>
<div>mask-border-outset</div>
</body>
</html>
Internal
External