# skewY()

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.

This transformation is a shear mapping (transvection) that distorts each point within an element by a certain angle in the vertical direction. The ordinate 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

```skewY(a)
```

### Values

`a`
Is an `<angle>` representing the angle to use to distort the element along the ordinate.
Cartesian coordinates on ℝ2 Homogeneous coordinates on ℝℙ2 Cartesian coordinates on ℝ3 Homogeneous coordinates on ℝℙ3
$\left(\begin{array}{c}10\\ tan\left(ax\right)1\end{array}\right)$ $\left(\begin{array}{cc}10& 0\\ tan\left(ax\right)1& 0\\ 0& 0& 1\end{array}\right)$ $\left(\begin{array}{cc}10& 0\\ tan\left(ax\right)1& 0\\ 0& 0& 1\end{array}\right)$ $\left(\begin{array}{ccc}10& 0& 0\\ tan\left(ax\right)1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right)$
`[1 tan(a) 0 1 0 0]`

## Examples

### HTML

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

### CSS

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

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

## Specifications

Specification Status Comment
CSS Transforms Level 1
The definition of 'skewY()' in that specification.
Working Draft Initial definition

## Browser compatibility

Please see the `<transform-function>` data type for compatibility info.