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Showing content from http://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/skewY below:

skewY() - CSS | MDN

skewY()

Baseline Widely available

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(-0.06turn);

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 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 ( 1 0 tan ( a ) 1 ) \left( \begin{array}{cc} 1 & 0 \\ \tan(a) & 1 \end{array} \right) ( 1 0 0 tan ( a ) 1 0 0 0 1 ) \left( \begin{array}{ccc} 1 & 0 & 0 \\ \tan(a) & 1 & 0 \\ 0 & 0 & 1 \end{array} \right) ( 1 0 0 tan ( a ) 1 0 0 0 1 ) \left( \begin{array}{ccc} 1 & 0 & 0 \\ \tan(a) & 1 & 0 \\ 0 & 0 & 1 \end{array} \right) ( 1 0 0 0 tan ( a ) 1 0 0 0 0 1 0 0 0 0 1 ) \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 
<div>Normal</div>
<div class="skewed">Skewed</div>
CSS 
div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}

.skewed {
  transform: skewY(40deg);
  background-color: pink;
}
Result Specifications Browser compatibility See also

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