skewY()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

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

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

[フレーム]

Specifications

Specification
CSS Transforms Module Level 1 # funcdef-transform-skewy

Browser compatibility

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This page was last modified on ⁨Oct 10, 2025⁩ by MDN contributors.

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