acos()
The acos()
CSS function is a trigonometric function that returns the inverse cosine of a number between -1
and 1
. The function contains a single calculation that returns the number of radians representing an <angle>
between 0deg
and 180deg
.
Syntax
css
/* Single <number> values */
transform: rotate(acos(-0.2));
transform: rotate(acos(2 * 0.125));
/* Other values */
transform: rotate(acos(pi / 5));
transform: rotate(acos(e / 3));
Parameter
The acos(number)
function accepts only one value as its parameter.
number
-
A calculation which resolves to a
<number>
between-1
and1
.
Return value
The inverse cosine of an number
will always return an <angle>
between 0deg
and 180deg
.
- If
number
is less than-1
or greater than1
, the result isNaN
. - If
number
is exactly1
, the result is0
.
Formal syntax
Examples
Rotate elements
The acos()
function can be used to rotate
elements as it return an <angle>
.
HTML
html
<div class="box box-1"></div>
<div class="box box-2"></div>
<div class="box box-3"></div>
<div class="box box-4"></div>
<div class="box box-5"></div>
CSS
css
div.box {
width: 100px;
height: 100px;
background: linear-gradient(orange, red);
}
div.box-1 {
transform: rotate(acos(1));
}
div.box-2 {
transform: rotate(acos(0.5));
}
div.box-3 {
transform: rotate(acos(0));
}
div.box-4 {
transform: rotate(acos(-0.5));
}
div.box-5 {
transform: rotate(acos(-1));
}
Result
Specifications
Specification |
---|
CSS Values and Units Module Level 4 # trig-funcs |
Browser compatibility
BCD tables only load in the browser