`skewY()` CSS function

The skewY() CSS function defines a transformation that skews an element in the vertical direction on the 2D plane. Its result is a <transform-function> data type.

Try it

transform: skewY(0);

transform: skewY(35deg);

transform: skewY(-0.06turn);

transform: skewY(0.352rad);

<section id="default-example">
  <img
    class="transition-all"
    id="example-element"
    src="/shared-assets/images/examples/firefox-logo.svg"
    width="200" />
</section>

This transformation is a shear mapping (transvection) that distorts each point within an element by a certain angle in the vertical direction. The ordinate (vertical, y-coordinate) of each point is modified by a value proportionate to the specified angle and the distance to the origin; thus, the farther from the origin a point is, the greater will be the value added it.

Syntax

css

skewY(a)

Values

a: Is an <angle> representing the angle to use to distort the element along the ordinate (vertical, y-coordinate).

Cartesian coordinates on ℝ^2	Homogeneous coordinates on ℝℙ^2	Cartesian coordinates on ℝ^3	Homogeneous coordinates on ℝℙ^3
$\left( \begin{array}{cc} 1 & 0 \\ \tan(a) & 1 \end{array} \right)$	$\left( \begin{array}{ccc} 1 & 0 & 0 \\ \tan(a) & 1 & 0 \\ 0 & 0 & 1 \end{array} \right)$	$\left( \begin{array}{ccc} 1 & 0 & 0 \\ \tan(a) & 1 & 0 \\ 0 & 0 & 1 \end{array} \right)$	$\left( \begin{array}{cccc} 1 & 0 & 0 & 0 \\ \tan(a) & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array} \right)$
	`[1 tan(a) 0 1 0 0]`

Formal syntax

<skewY()> = 
  skewY( [ <angle> | <zero> ] )

Examples

undefined

HTML

html

<div>Normal</div>
<div class="skewed">Skewed</div>

CSS

css

div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}

.skewed {
  transform: skewY(40deg);
  background-color: pink;
}

Result

Specifications

CSS Transforms Module Level 1

skewY() CSS function